TRANQUILIZER Antonyms There is 0 antonym of the word tranquilizer. (opposite meanings)Sorry, we couldn't find any antonyms for TRANQUILIZER!Did you mean?Definition of TRANQUILIZERSynonyms of TRANQUILIZERAlso try opposite words for..tranquilizetranquilizedtranquilizingtranquilizerstranquilization