stagnate v. + Add to list US //ˈstæɡˌneɪt// UK //stæɡnˈeɪt// stag·nate SynonymsAntonymsEtymology Synonyms idlelazeslug Antonyms workOrigin Borrowed from Latin stāgnātus, past participle of stāgnō (“cover the land as a lake, stagnate”), from stāgnum (“pond, swamp”).