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Prepositions after adjectives

false in or false to

False to is the standard expression for disloyal or unfaithful behaviour. False in is used when describing incorrect details within something.

Quick answer

False to vs. false in

Use false to for disloyalty or failure to keep principles. Use false in when referring to an error inside a statement, report, or description.

He was false to his promises.
The article was false in several details.
She remained false to her own values.

Choose the pattern by meaning

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

1
false to + person/principle

Showing disloyalty or betrayal

This is the standard pattern for failing to stay loyal or true.

He proved false to his friends.
The leader was false to his ideals.
2
false in + detail/statement

Describing incorrect information

Use in to specify where something is inaccurate.

The report is false in several places.
3
false to oneself

Acting against personal beliefs

This expression means behaving against your real values or character.

She felt false to herself after agreeing.
4
false with + person

Nonstandard or awkward combination

False with is generally not idiomatic for loyalty or accuracy.

Writers usually avoid false with in this meaning.

See the difference in context

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

Construction
Example
Meaning
false to
He was false to his country.
disloyal or unfaithful
false in
The document is false in several claims.
incorrect in particular details
false with
This combination is generally unnatural in this context.
not a standard pattern for false
false about
She was false about her qualifications.
about introduces the topic of a lie

Common mistakes

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

Using in for loyalty

Use false to when talking about betrayal or disloyalty.

✕ He was false in his friends. ✓ He was false to his friends.

Using to for factual errors

Use false in when describing incorrect parts of something.

✕ The statement was false to several details. ✓ The statement was false in several details.

Using false with for betrayal

False with is not the usual pattern in this meaning.

✕ She was false with her partner. ✓ She was false to her partner.

Quick practice

Choose the expression that matches the intended meaning.

1. He was false ___ his promises.
2. The article is false ___ some important facts.
3. She did not want to be false ___ herself.

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Frequently asked questions

What does false to mean?

It means disloyal, unfaithful, or acting against principles or promises.

Is false in common?

It is less common than false to, but it is used to describe incorrect details within something.

Can I say false with someone?

Not usually. False to someone is the natural expression for betrayal or disloyalty.

face-to-face-with-in-at-for, to "fair to" or "fair in"? faithful to, in, of, with or for? falling of, in, out, into or off? famed for, as, in or throughout? familiar with, to, from or in? famous for, in, of, by or as? fanatical about, in, as, for or of? "fantastic for" or "fantastic in"? far from, in, to, for or with? fascinating to, about, in, for or as? "fashionable in" or "fashionable for"?

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