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Prepositions after adjectives

Inadequate for or inadequate in?

Inadequate for and inadequate in are both used in English, but with different meanings. For usually refers to suitability, while in refers to weakness in a skill or area.

Quick answer

Inadequate for vs. inadequate in

Use inadequate for when something is not enough or not suitable for a purpose. Use inadequate in when referring to weakness or lack of ability in a subject or activity.

The equipment is inadequate for heavy use.
He feels inadequate in mathematics.
The funding was inadequate for the project.

Choose the pattern by meaning

These forms are not interchangeable. Choose the construction by meaning, not by which preposition appears most often.

1
inadequate for + purpose

Showing lack of suitability

Use for when something is insufficient or unsuitable for a task, purpose, or need.

The room is inadequate for large meetings.
Her explanation was inadequate for the situation.
2
inadequate in + subject/skill

Talking about weak ability

Use in before an area where someone lacks skill, knowledge, or effectiveness.

He is inadequate in dealing with conflict.
The team was inadequate in defence.

See the difference in context

The same subject can take different constructions because each sentence answers a different question.

Construction
Example
Meaning
inadequate for
The software is inadequate for business use.
Not sufficient or suitable for a purpose.
inadequate in
She feels inadequate in public speaking.
Lacking ability or effectiveness in an area.
inadequate to
The resources are inadequate to meet demand.
Common alternative structure followed by a verb phrase.
inadequate at
He is inadequate at managing deadlines.
Possible in informal English, though inadequate in is more formal and common.

Common mistakes

Some combinations appear in real text but do not mean what learners often assume.

Using in for purposes

Use for when referring to suitability for a task or purpose.

✕ The equipment is inadequate in construction work. ✓ The equipment is inadequate for construction work.

Using for with skills

Use in before subjects or abilities.

✕ She feels inadequate for mathematics. ✓ She feels inadequate in mathematics.

Confusing inadequate with incorrect

Inadequate means not enough or not sufficient, not necessarily wrong.

✓ The budget was inadequate for the expansion.

Quick practice

Choose the expression that matches the intended meaning.

1. The training was ___ the job requirements.
2. He feels ___ writing formal reports.
3. The resources were ___ meet demand.

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Frequently asked questions

Is inadequate for more common than inadequate in?

They are used in different situations, so neither replaces the other.

Can I say inadequate to do something?

Yes. Inadequate to is followed by a verb phrase, such as inadequate to solve the problem.

What does inadequate in mean?

It means lacking ability or effectiveness in a subject, skill, or area.

ideal-for-in-as-at, from "identical to" or "identical with"? identifiable by, as, with, in or to? "idle for" or "idle in"? ignorant of, about, to, in or on? "illegal in" or "illegal for"? illustrative of, in, rather or for? ill with, in, for, at or of? "immune to" or "immune from"? "impatient with" or "impatient for"? "imperative for" or "imperative to"? impervious to, from or in?

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