Antonyms of adj unbeaten

1 sense of unbeaten

Sense 1
unbeaten, unconquered, unvanquished -- (not conquered)

INDIRECT (VIA undefeated) -> defeated -- (beaten or overcome; not victorious; "the defeated enemy")

Similarity of adj unbeaten

1 sense of unbeaten

Sense 1
unbeaten, unconquered, unvanquished -- (not conquered)
       => undefeated (vs. defeated) -- (victorious; "undefeated in battle"; "an undefeated team")