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Prepositions after adjectives

Ruthless in or ruthless with

Both ruthless in and ruthless with are correct, but they express different relationships.

Quick answer

Ruthless in vs ruthless with

Ruthless in describes the area or activity where someone shows ruthlessness. Ruthless with refers to the people or things treated harshly.

She is ruthless in negotiations
The coach was ruthless with underperforming players

Choose the pattern by meaning

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

1
ruthless in + activity

Showing harshness in a situation

In introduces the field or activity.

He became ruthless in business
2
ruthless with + person or thing

Treating someone harshly

With introduces the target of the behaviour.

The editor was ruthless with weak drafts

See the difference in context

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

Construction
Example
Meaning
ruthless in
ruthless in competition
harsh in a specific activity
ruthless with
ruthless with opponents
harsh toward people or things
ruthless about
ruthless about cutting costs
determined regarding a goal

Common mistakes

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

Using with for activities

Use in for fields or situations.

✕ ruthless with negotiations ✓ ruthless in negotiations

Using in for people

Use with when naming the people affected.

✕ ruthless in employees ✓ ruthless with employees

Quick practice

Choose the expression that matches the intended meaning.

1. She is ruthless ___ marketing.
2. The manager was ruthless ___ lazy staff.
3. They became ruthless ___ reducing expenses.

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Frequently asked questions

Can both patterns be correct?

Yes. The choice depends on meaning.

What follows ruthless in?

Usually an activity, field, or situation.

What follows ruthless with?

Usually people, teams, or things receiving harsh treatment.

racist-in-against-for-to, towards "radical in" or "radical for"? rampant in, among, with, on or throughout? "rare in" or "rare for"? "rational for" or "rational in"? "raw in", "raw for" or "raw with"? reachable by, from, on, in or through? "reactive to", "reactive rather" or "reactive in"? ready for, to, in, at or by? "realistic about" or "realistic in"? "real to", "real for" or "real in"? rearing of, as or on?

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