hard working (hardworking)

Quick rule: use hardworking as one word when describing a person or group. Hard-working is an acceptable house-style alternative. Hard working (two words) is usually wrong as an adjective; use works hard for the action.

Quick answer

Use hardworking (one word) as an adjective. Hard-working is acceptable in some style guides. Use works hard / is working hard for the action. Never leave a space when you mean an adjective.

Adjective: hardworking (preferred) or hard-working (style choice).
Action: works hard, worked hard, is working hard.
If you spot hard working split, either join it (hardworking) or rephrase to works hard.

Core rule - one word if it describes someone

If the phrase modifies a noun, write it as one word: hardworking student, hardworking team. If you mean the activity, leave the words separate: she works hard on the task.

Preferred adjective: hardworking
Acceptable hyphenated form: hard-working (depending on house style)
Incorrect as adjective: hard working (two words)

Wrong: He is a hard working engineer who fixed the issue.
Right: He is a hardworking engineer who fixed the issue.
Wrong: They are hard working; they never stop.
Right: They are hardworking; they never stop.

Hyphenation and spacing: when a hyphen is okay

Most modern dictionaries list hardworking as one word. Hard-working remains acceptable if your style guide prefers hyphenation for compound adjectives before nouns. Never leave a space when you mean an adjective; use works hard for the verb phrase.

Before a noun: hardworking (preferred) or hard-working (if your guide requires hyphens).
After a linking verb: He is hardworking (no hyphen).
Action phrase: She works hard (separate words).

Usage: A hardworking committee completed the audit.
Also acceptable: A hard-working committee completed the audit.
Wrong: She is a hard working scientist. (incorrect spacing)
Right: She is a hardworking scientist.

Grammar - adjective vs. verb phrase

Quick tests: can you replace the phrase with diligent or industrious? If yes, use hardworking. If you can change tense (works hard / worked hard), treat it as a verb phrase and keep the words separate.

Adjective test: hardworking ↔ diligent (if it fits, use one word).
Action test: works hard or is working hard → separate words as a verb + adverb.
On résumés, prefer measurable accomplishments over the vague adjective hardworking.

Wrong: He's hard working on the project and deserves praise.
Right: He is working hard on the project and deserves praise.
Wrong: She's a hard working researcher with many publications.
Right: She's a hardworking researcher with many publications.

Real usage and tone: formal, neutral, casual

Formal writing (reports, CVs): use hardworking sparingly and prefer specific results. Neutral: choose hardworking for traits or works hard for actions. Casual: works hard sounds natural; hardworking is also fine.

Formal: prefer hardworking plus concrete achievements.
Neutral: use the form that matches trait vs action.
Casual: works hard often sounds friendlier and more conversational.

Work - Formal: Hardworking team member; consistently exceeded targets.
Work - Neutral: Our hardworking interns improved process efficiency by 15%.
Casual: She works hard to keep the garden alive every summer.

Try your own sentence

Test the whole sentence in context: swap with diligent or try the verb form. Context usually makes the correct choice obvious.

Examples you can copy - many wrong/right pairs

Grouped examples for work, school, and casual contexts. Copy the corrected sentence or adapt it.

Work - Wrong: He is a hard working manager who never misses a meeting.
Work - Right: He is a hardworking manager who never misses a meeting.
Work - Wrong: Our hard working sales reps beat quota every month.
Work - Right: Our hardworking sales reps beat quota every month.
Work - Wrong (CV): Hard working and motivated-responsible for client accounts.
Work - Right (CV): Hardworking and motivated - managed client accounts.
School - Wrong: She's a hard working student who studies late nightly.
School - Right: She's a hardworking student who studies late every night.
School - Wrong: Hard working researchers turned in the draft late.
School - Right: Hardworking researchers submitted the draft late.
School - Wrong: A hard working study plan helped him pass the exam.
School - Right: A hardworking study plan helped him pass the exam.
Casual - Wrong: My neighbor is hard working and always fixes things.
Casual - Right: My neighbor is hardworking and always fixes things.
Casual - Wrong: We're a hard working family juggling jobs and school.
Casual - Right: We're a hardworking family juggling jobs and school.
Casual - Wrong: They are so hard working, always helping out.
Casual - Right: They're so hardworking, always helping out.

Rewrite help - ready-to-use rewrites

Three quick steps: decide adjective vs action; if adjective → use hardworking (or hard-working if required); if action → use works hard / is working hard or show a specific achievement.

If 'hard working' appears before a noun, change it to 'hardworking'.
If it describes effort, change to 'works hard' or 'is working hard'.
On résumés, replace the adjective with measurable accomplishments.

Rewrite:
Original: "He is a hard working intern." → "He is a hardworking intern."
Rewrite:
Original: "She's hard working and often late." → "She works hard but often arrives late."
Rewrite:
Original: "Our hard working team improved metrics." → "Our hardworking team improved metrics." or "Our team worked hard to increase metrics by 12%."
Rewrite (CV): Original: "Hard working and reliable." → "Hardworking and reliable." Better: "Consistently met deadlines and improved accuracy by 10%."
Rewrite:
Original: "He's hard working at his job." → "He works hard at his job."

Memory tricks and quick checklist

Use quick tests to fix sentences fast.

Adjective test: replace the phrase with diligent or industrious - if it fits, use hardworking.
Action test: can you change tense to works hard/worked hard? If so, keep separate words.
Checklist: before a noun → hardworking. After a linking verb → hardworking. Describing action → works hard.

Similar mistakes to watch for

The same spacing and hyphenation issues appear in compounds like well-known, part-time, self-employed. Also watch words that look related but mean something else, such as hardly.

well-known - hyphenated before a noun; avoid well known as two words.
part-time - hyphen when adjectival: part-time role vs. work part time.
self-employed - hyphenated compound; watch spacing.
hardly - means "almost not" and is not a synonym of hardworking.

Wrong: He's hardly working on the project. (means almost not working)
Usage: Correct: She has a part-time job. (hyphenated adjective)

FAQ

Is hardworking one word or two?

Hardworking is one word when used as an adjective. Hard working (two words) is usually incorrect as an adjective. Hard-working (hyphenated) is an acceptable alternative in some style guides.

Should I hyphenate hard-working before a noun?

You can if your house style requires hyphenation for compound adjectives, but most modern guides prefer hardworking without a hyphen.

Which is better on a CV: hardworking or works hard?

Neither is ideal on its own. Use hardworking sparingly and pair it with concrete achievements. Better: replace subjective terms with specific results (e.g., met 100% of monthly targets).

How do I fix 'hard working' quickly?

Decide whether you mean an adjective (combine to hardworking) or an action (use works hard). If unsure, rephrase to show the specific action or result.

Is 'hardly working' the same as 'hardworking'?

No. 'Hardly working' means barely working (almost not working). 'Hardworking' means industrious - the opposite.

Still unsure which fix to use?

If you're uncertain, test the phrase in the sentence: swap with diligent or try the verb form works hard. When possible, replace vague adjectives with a clear action or a measurable outcome. Pick one style for a document and be consistent.