unconsciousnessEnglishOxford English Thesaurusunconsciousness noun someone gave me a crack across the head and I slipped into unconsciousness: insensibility, senselessness, stupefaction, oblivion, unawareness, blankness, lack of sensation, lack of feeling; blackout, coma, stupor, torpor, trance, sopor, collapse. ▷antonyms consciousness.unconsciousness Oxford Dictionary of English