Synonyms and related words :
a stranger to, asleep, blind to, caught napping, dead to, deaf, deaf and dumb, deaf to, deaf-eared, deaf-mute, deafened, dull-eared, earless, hard of hearing, impercipient, in ignorance of, incognizant, insensible, insensible to, mindless, napping, nonconceiving, not with it, out of it, stone-deaf, stunned, surd, thick of hearing, tone-deaf, unaware, unaware of, unconscious, unconscious of, uninsightful, unknowing, unmindful, unmindful of, unperceiving, unprehensive, unrealizing, unseeing, unsuspecting, unwitting, witless, word-deaf