FAST ASLEEP Antonyms There are 3 antonyms of the phrase fast asleep. (opposite meanings)Did you mean?Definition of FAST ASLEEPBest Opposite Words For FAST ASLEEPTop 20Top 10 Top 20 (Default)Top 50 Top 100 All All (Default)WordsPhrases All All (Default)Verb Noun Adjective Adverb RankWordSave?Synonyms..UsageType1activeadjectiveadj2alertverb, nounv, n3awakeverb, adjectivev, adj Alternatives for ACTIVE Words (27)agilebusyenergeticnimblealivedynamicanimatedbriskbustlingengagedfastindustriouslivelypromptquickspiritedvibrantvigorousactingdiligentoperativetopworkingdeedfulcombat-readyfightingparticipatingPhrases (3)in forceactive agentactive voiceOpposite words for active Alternatives for ALERT Words (22)watchfulattentiveawarekeenobservantpromptquickresponsivesharpvigilantalarmalarumalertingaliveawakebrisklivelymerryrattlingsnappyspankingzippyPhrases (2)qui vivewarning signalOpposite words for alert Alternatives for AWAKE Words (15)consciousalertawakeawakenedwakefulwide-awakeawakencrylucidwarywokealivearousewakewakenPhrases (3)wake upbring roundcome aliveOpposite words for awake