Synonyms and related words :
a stranger to, asleep, bare-handed, blind to, caught napping, childlike, confiding, credulous, dead to, deaf to, defenseless, dependent, depending, doting, easily taken in, easy of belief, fond, guardless, guileless, gullible, helpless, ignorant, impercipient, in ignorance of, inclined to believe, incognizant, inexpectant, infatuated, ingenuous, innocent, insensible, insensible to, mindless, naive, napping, nonconceiving, nonexpectant, not with it, off guard, out of it, overconfiding, overcredulous, overtrustful, overtrusting, reliant, relying, superstitious, trustful, trusting, trusty, unadmonished, unadvised, unanticipating, unanticipative, unarmed, unarmored, unattended, unaware, unaware of, unconscious, unconscious of, uncovered, uncritical, undefended, undoubting, unexpecting, unforewarned, unfortified, ungarrisoned, unguarded, unguessing, unhearing, uninformed, uninsightful, unknowing, unmindful, unmindful of, unperceiving, unprehensive, unprepared, unprotected, unready, unrealizing, unscreened, unseeing, unsheltered, unshielded, unskeptical, unsuspicious, unwarned, unwary, unwatched, unwitting, weaponless, without suspicion, witless