stiff 17 synonyms and 5 antonyms for stiff, ranked by how commonly they're used. Adjective — Rigid; not easily bent or moved. Synonyms for stiff firm frozen hard hardened inflexible immalleable ossified petrified rigid solid stark stubborn taut tight unbending unlimber unyielding Antonyms for stiff flexible malleable loose slack soft ← Back to the full definition of stiff
