water resistant (water-resistant)

Many writers leave out the hyphen in "water-resistant," and that small mark often changes clarity. Use a hyphen when the words act together as a single adjective before a noun; after a noun or linking verb you can hyphenate for clarity or rewrite.

Below are short rules, plenty of paste-ready wrong→right fixes, practical rewrites, and quick checks you can use immediately.

Quick answer

Use water-resistant with a hyphen when the words form one adjective before a noun (a water-resistant jacket). After a linking verb (The jacket is water-resistant) hyphenation is optional in some guides but recommended for clarity; you can also rewrite as resistant to water or resists water.

Before a noun: hyphenate - a water-resistant watch.
After a linking verb (be, seem, become): hyphenate for clarity or rewrite - The watch is water-resistant / The watch resists water.
If a compound sounds awkward, rewrite: resistant to water or resists water.

Core explanation: why the hyphen matters

The hyphen links words that form a single modifier. In "water-resistant jacket" the hyphen signals that water + resistant work together to describe jacket.

Without it, readers may pause or misread-especially in technical, academic, or dense copy. Hyphens speed comprehension and reduce ambiguity.

Compound modifier = word1-word2 + noun (water-resistant jacket).
Insert "that is" after the modifier: if it sounds odd, a hyphen before the noun is likely needed.
Rewrite options (resistant to water / resists water) avoid hyphenation entirely when appropriate.

Wrong: The phone case is water resistant.
Right: The phone case is water-resistant.
Alternative: The phone case resists water.

Hyphenation rules you can use now

Use these quick rules when deciding whether to hyphenate compound modifiers.

Hyphenate compound modifiers that come directly before a noun: a water-resistant speaker.
After linking verbs (predicative position) hyphenation is optional; hyphenate for clarity or rewrite.
Don't hyphenate adverb + adjective when the adverb ends in -ly: highly water resistant (no hyphen after highly).
Follow style guides for technical specs and brand conventions, but be consistent across a document.
Numbers and measurements in modifiers usually use hyphens: a 5-year-old, a 10-meter water-resistant enclosure.

Right: We tested a water-resistant backpack for the review.
Usage: The backpack is water-resistant and passed the field test.
Note: Highly water resistant - do not write highly-water-resistant.

Spacing and punctuation: small typography errors to catch

Use a simple hyphen (-) with no spaces: water-resistant. Avoid spaces around the hyphen and do not substitute an en dash or em dash.

If your editor supports a nonbreaking hyphen, use it to prevent a compound from breaking across lines in long technical names.

Correct: water-resistant (no spaces).
Wrong: water - resistant (spaces), or using an en dash instead of a hyphen.
Use a nonbreaking hyphen for brand or product names that must not split at line ends.

Wrong: The case is water - resistant.
Wrong: The case is water-resistant (en dash).
Right: The case is water-resistant.

Real usage and tone: work, school, and casual examples

Professional and academic writing prefers the hyphen for precision. Casual messages often tolerate omission, but consistent hyphenation looks cleaner in public or shared writing.

Work: hyphenate in specs, emails, and proposals; rewrite where a clause reads better.
School: hyphenate in essays and lab reports; cite a style guide if required.
Casual: omission is common, but hyphenating makes public posts and profiles appear polished.

Work: Our vendor supplied a water-resistant material for the prototype enclosure.
Work: Please confirm the device is water-resistant to IP67 before ordering.
Work: The specification calls for a water-resistant coating on all connectors.
School: The lab notebook recorded a water-resistant sample after the rinse test.
School: In the design report, label components as water-resistant where they modify nouns.
School: For clarity,
rewrite: The seal is resistant to water.
Casual: Grab my water-resistant jacket; it won't soak through in a drizzle.
Casual: My watch is water-resistant, so I can wash my hands without worry.
Casual: That phone case is water-resistant, right?

Common wrong → right pairs you can paste into your writing

Copy these replacements when proofreading. Each wrong example is followed by a hyphenated correction; some include alternative rewrites without a hyphen.

Wrong: The camera is water resistant and dustproof.
Right: The camera is water-resistant and dustproof.
Wrong: I bought a water resistant phone case yesterday.
Right: I bought a water-resistant phone case yesterday.
Wrong: Our prototype uses a water resistant sealant.
Right: Our prototype uses a water-resistant sealant.
Wrong: This label says the product is water resistant up to three meters.
Right: This label says the product is water-resistant up to three meters.
Wrong: We need a water resistant exterior for the device.
Right: We need a water-resistant exterior for the device.
Wrong: List water resistant materials separately in the appendix.
Right: List water-resistant materials separately in the appendix.
Original: The fabric is water resistant.
Rewrite: The fabric is water-resistant. Or: The fabric resists water. Or: The fabric is resistant to water.

Try your own sentence

Test the whole sentence rather than the phrase alone. Move the phrase after the noun, read it aloud as one idea, or swap in a rewrite to see which option reads best.

How to fix your sentence (three fast rewrite patterns)

Choose the pattern that fits tone and structure: add a hyphen, use "resistant to water," or switch to an active verb.

Quick fix: Insert a hyphen - water-resistant.
Formal rewrite: Change to "resistant to water."
Concise rewrite: Use a verb - "resists water."

Original: The device is water resistant after testing. Hyphenate: The device is water-resistant after testing.
Formal: The device is resistant to water after testing. Active: The device resists water after testing.
Original: We need a water resistant coating for the enclosure. Hyphenate: We need a water-resistant coating for the enclosure.
Formal: We need a coating that is resistant to water. Active: We need a coating that resists water.

Grammar note: attributive vs predicative position

Attributive (before the noun): hyphenate compound modifiers - a water-resistant cover. Predicative (after a linking verb): many guides allow no hyphen, but hyphenating is common and often clearer.

When precision matters-legal text, specifications, or academic writing-prefer the hyphen or rewrite to avoid ambiguity.

Attributive = hyphenate (water-resistant jacket).
Predicative = hyphenate for clarity or rewrite (The jacket is resistant to water).
If the modifier contains an -ly adverb, do not hyphenate between the adverb and adjective (extremely water resistant).

Attributive: a water-resistant jacket (hyphenated).
Predicative: The jacket is water-resistant (hyphen recommended) or The jacket is resistant to water (rewritten).

Memory tricks and quick checks

Two fast tests: read the pair aloud as one adjective, and move the phrase after the noun. If it sounds like one idea, hyphenate in attributive position.

If you remain unsure, hyphenate in formal writing-it rarely hurts and usually clarifies.

Mnemonic: two words, one idea → hyphenate.
Quick edit: search your document for "water resistant" and evaluate each instance before a noun.
Check linking verbs: if the phrase reads oddly, rewrite (resistant to water) or hyphenate.

Usage test: "water-resistant cover" sounds like one idea-hyphenate. "The cover is water resistant"-consider hyphenating or rewriting.

Similar mistakes and other compounds to watch

Apply the same decision process to other compound modifiers.

full-time vs full time
high-quality vs high quality
long-term vs long term
user-friendly vs user friendly
well-known vs well known

Wrong: She is a high quality designer.
Right: She is a high-quality designer.
Wrong: We need a long term strategy.
Right: We need a long-term strategy.
Wrong: That is a user friendly interface.
Right: That is a user-friendly interface.

FAQ

Is "The watch is water resistant" correct?

You can write it that way, but hyphenating-The watch is water-resistant-is clearer. Alternatively: The watch resists water or The watch is resistant to water.

Do product labels need a hyphen?

Labels vary. For manuals, specs, and marketing copy hyphenate. Follow the brand's packaging style for labels, and keep supporting documents consistent.

When should I use "resistant to water" instead of "water-resistant"?

Use "resistant to water" when the compound feels awkward, when you want a more formal tone, or to avoid hyphen debates after a linking verb.

Are there cases where you should not hyphenate?

Do not hyphenate adverb + adjective pairs with an -ly adverb (e.g., highly water resistant). Also follow any specific style guide or brand guideline you must use.

Quick tip to find unhyphenated compounds in a long document?

Search for common pairs like "water resistant", "high quality", and "long term". Then choose: add a hyphen, rewrite to "resistant to X", or use an active verb. When in doubt, hyphenate in professional writing.

Need a quick hyphen check?

Paste a sentence into a grammar checker or search your document for "water resistant" to find and fix instances. Choose one approach per document and apply it consistently: hyphenate before nouns, rewrite or hyphenate after verbs.