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Preposition after adjective

ineffective in, at, for, against or as?

Different prepositions after ineffective express different ideas. The most common patterns are ineffective at, ineffective in, and ineffective against.

Quick answer

Which preposition follows ineffective?

Use ineffective at for poor performance in an activity, ineffective in for failure within a process or role, and ineffective against for lack of success against a problem or threat. For and as are also possible in certain contexts.

He was ineffective at managing large teams.
The drug proved ineffective against the virus.
The policy was ineffective in reducing costs.

Choose the pattern by meaning

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

1
ineffective at + activity

Showing poor skill or performance

Use at before an activity or task someone does badly.

She is ineffective at handling conflict.
The manager became ineffective at motivating staff.
2
ineffective in + process/role

Describing failure within a situation

Use in when referring to performance within a system, role, or process.

The campaign was ineffective in changing public opinion.
He felt ineffective in his new position.
3
ineffective against + threat/problem

Showing lack of success against something harmful

Against is common with medicines, strategies, and protection.

The treatment is ineffective against severe infections.
Old passwords are ineffective against modern cyberattacks.
4
ineffective as + role/function

Evaluating suitability in a role

Use as when judging performance in a particular capacity.

The software was ineffective as a teaching tool.
He proved ineffective as team leader.

See the difference in context

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

Construction
Example
Meaning
ineffective in
The policy was ineffective in reducing delays.
Failure within a process or action.
ineffective at
She is ineffective at giving feedback.
Poor skill in an activity.
ineffective for
This treatment is ineffective for some patients.
For identifies the people or situations not helped by something.
ineffective against
The vaccine was ineffective against the new strain.
Lack of protection or success against a threat.
ineffective as
The plan was ineffective as a long-term solution.
Unsuitable or unsuccessful in a role or function.

Common mistakes

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

Using at with results instead of activities

At usually refers to skills or actions, not outcomes.

✕ The law was ineffective at reducing crime. ✓ The law was ineffective in reducing crime.

Using against for general situations

Against is best for threats, attacks, diseases, or opposition.

✕ She was ineffective against office communication. ✓ She was ineffective in office communication.

Confusing in and as

In refers to performance within a process, while as refers to a role.

✕ The app was ineffective in a learning tool. ✓ The app was ineffective as a learning tool.

Omitting the needed preposition

Ineffective usually needs a preposition before the following noun or verb form.

✕ The strategy was ineffective stopping fraud. ✓ The strategy was ineffective in stopping fraud.

Quick practice

Choose the expression that matches the intended meaning.

1. The cream was ineffective ___ the infection.
2. He is ineffective ___ managing remote teams.
3. The programme was ineffective ___ improving literacy rates.

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Frequently asked questions

What is the difference between ineffective at and ineffective in?

At focuses on skill in an activity, while in refers to performance within a process, role, or situation.

Can ineffective be followed by against?

Yes. It is common when discussing medicine, security, defence, or protection.

Is ineffective for correct?

Yes. It means something does not work well for certain people, purposes, or situations.

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