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Preposition after adjective

Undefeated in, at, on, for or with?

Undefeated is commonly followed by in to refer to competitions, seasons, or events. Other prepositions usually introduce place, time, duration, or company.

Quick answer

Which preposition is used with undefeated?

Use undefeated in for competitions, leagues, or periods of play. Prepositions such as at, on, for, and with usually add extra information rather than directly completing the adjective.

The team remained undefeated in the tournament.
She is still undefeated in international matches.
The club stayed undefeated for two seasons.

Choose the pattern by meaning

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

1
undefeated in + competition

Talking about success in events or leagues

Use undefeated in for tournaments, seasons, leagues, or categories.

They are undefeated in home games this year.
The boxer remained undefeated in his division.
2
undefeated for + period

Describing duration without losing

For introduces a length of time.

The team was undefeated for six months.
She stayed undefeated for the entire season.
3
undefeated at + place/event

Adding location or setting

At usually introduces a place or event rather than a complement selected by undefeated.

The club remains undefeated at home.
They were undefeated at the championship.

See the difference in context

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

Construction
Example
Meaning
undefeated in
The team is undefeated in the league.
Standard pattern for competitions or areas of play.
undefeated at
They are undefeated at home.
At introduces location or setting.
undefeated on
The player is undefeated on clay.
On refers to a playing surface or platform.
undefeated for
The club stayed undefeated for a year.
For introduces duration.
undefeated with
The coach is undefeated with the new lineup.
With introduces accompanying people or conditions.

Common mistakes

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

Using at instead of in for competitions

Use in for leagues, tournaments, and competitions.

✕ The team is undefeated at the league. ✓ The team is undefeated in the league.

Confusing duration and competition

For is used with time periods, not events.

✕ She was undefeated for the tournament. ✓ She was undefeated in the tournament.

Using on for general competition

On is mainly used for surfaces such as grass or clay.

✕ They are undefeated on the league. ✓ They are undefeated in the league.

Quick practice

Choose the expression that matches the intended meaning.

1. The squad remained ___ the entire tournament.
2. The player stayed undefeated ___ three years.
3. The tennis star is undefeated ___ clay courts this season.

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Frequently asked questions

What does undefeated in mean?

It means not losing any matches or contests in a competition, season, or category.

Can undefeated be followed by for?

Yes. Use undefeated for with a period of time, such as undefeated for two years.

Is undefeated at correct?

Yes, when at introduces a place or setting, such as undefeated at home.

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