Antonyms of adj flabby

1 sense of flabby

Sense 1
soft, flabby, flaccid -- (out of condition; not strong or robust; incapable of exertion or endurance; "he was too soft for the army"; "flabby around the middle"; "flaccid cheeks")

INDIRECT (VIA unfit) -> fit -- (physically and mentally sound or healthy; "felt relaxed and fit after their holiday"; "keeps fit with diet and exercise")

Similarity of adj flabby

1 sense of flabby

Sense 1
soft, flabby, flaccid -- (out of condition; not strong or robust; incapable of exertion or endurance; "he was too soft for the army"; "flabby around the middle"; "flaccid cheeks")
       => unfit (vs. fit) -- (not in good physical or mental condition; out of condition; "fat and very unfit"; "certified as unfit for army service"; "drunk and unfit for service")