88 synonyms for ignorant such as coarse, (as) thick as two short planks, a stranger to, bad-mannered, and boorish. Ignorant is an adjective, and its antonyms are educated and knowledgeable.
(as) thick as two short planks, a brick short of a load, airheaded, backward, benighted, chowderheaded, daft, dead from the neck up, dense, dim, divvy, dof, dopey, dotish, dozy, dumb, dumb-ass, empty-headed, glaikit, illiterate, inexperienced, mindless, not the full shilling, pig-ignorant, simple, slow on the uptake, stupid, thick, uneducated, unenlightened, uninformed, unintelligent, unknowledgeable, unlearned, unlettered, unqualified, unread, unscholarly, unschooled, unsophisticated, untaught, untrained, untutored, unworldly, and wet behind the ears.
A stranger to, blind to, clueless about, green about, in the dark about, inexperienced in, innocent about, insensible, naive about, nescient, not having the faintest about, oblivious to, strange to, unacquainted with, unaware, unconscious, unconversant with, unenlightened about, unfamiliar with, uninformed about, uninitiated in, unschooled in, and without knowledge.
Bad-mannered, boorish, coarse, crude, discourteous, gross, ill-humoured, ill-mannered, impolite, insensitive, loutish, oafish, rude, sullen, surly, uncivil, ungracious, unmannerly, and vulgar.