What's the opposite of flaccid?

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Complete Dictionary of Synonyms and Antonyms flaccid. Antonyms: firm, muscular, braced, plump, chubby, brawny. Synonyms: flabby, limber, lax, tabid.
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This abnormal condition may be caused by disease or by trauma affecting the nerves associated with the involved muscles. For example, if the somatic nerves to a skeletal muscle are severed, then the muscle will exhibit flaccid paralysis. When muscles enter this state, they become limp and cannot contract..
Complete Dictionary of Synonyms and Antonyms flaccid. Antonyms: firm, muscular, braced, plump, chubby, brawny. Synonyms: flabby, limber, lax, tabid.