Synonyms and related words :
arbitrary, artless, asleep, bare-handed, bluff, blunt, born yesterday, broad, brusque, candid, capricious, careless, childlike, confiding, culpably negligent, defenseless, derelict, direct, downright, explicit, exposed, forthright, frank, frankhearted, free, free-speaking, free-spoken, free-tongued, genuine, goofing off, guardless, guileless, hasty, heart-to-heart, heedless, helpless, imprudent, inadvertent, inattentive, incautious, inconsiderate, indiscreet, ingenu, ingenuous, innocent, inobservant, involuntary, laissez-faire, lax, loose, naive, napping, neglectful, neglecting, negligent, nodding, noninterfering, nonrestrictive, off-guard, open, openhearted, outspoken, overly permissive, permissive, plain, plain-spoken, procrastinating, reasonless, relaxed, remiss, round, scamping, simple, simplehearted, simpleminded, sincere, single-hearted, single-minded, skimping, slack, sleeping, slighting, slurring, straight, straight-out, straightforward, thoughtless, transparent, trustful, trusting, unalert, unarmed, unarmored, unattended, uncalculating, uncautious, unchecked, uncircumspect, unconscious, unconstrained, uncovered, undefended, undesigned, unequivocal, unfortified, ungarrisoned, unguided, unintended, unintentional, unmeant, unmeditated, unplanned, unpremeditated, unprepared, unprompted, unprotected, unpurposed, unready, unreasoning, unreflecting, unreserved, unrestrained, unrigorous, unscreened, unsheltered, unshielded, unsophisticated, unsuspecting, unsuspicious, unthinking, unthought-of, unthoughtful, unvigilant, unwarned, unwary, unwatched, unwatchful, unwise, unwitting, vulnerable, weaponless