a stranger to, abnormal, apish, asinine, asleep, batty, bedlamite, befooled, beguiled, bereft of reason, besotted, blind to, brainless, brainsick, buffoonish, caught napping, cockeyed, crackbrained, cracked, crazed, crazy, credulous, daffy, daft, dazed, dead to, deaf to, deluded, demented, deprived of reason, deranged, disoriented, distraught, dizzy, doting, dumb, empty-headed, fatuitous, fatuous, featherbrained, featherheaded, flaky, flighty, fluttery, fond, fool, foolheaded, foolish, frivolous, fuddled, futile, gaga, giddy, giddy-brained, giddy-headed, giddy-pated, giddy-witted, goofy, gulled, hallucinated, harebrain, harebrained, headless, idiotic, ignorant, ill-advised, ill-considered, ill-contrived, ill-devised, ill-gauged, ill-judged, imbecile, impercipient, impolitic, imprudent, in ignorance of, inadvisable, inane, incognizant, inconsiderate, indiscreet, inept, inexpedient, infatuated, injudicious, insane, insensate, insensible, insensible to, irrational, kooky, lackbrained, lean-minded, lean-witted, loco, loony, lunatic, mad, maddened, manic, maudlin, mazed, mental, mentally deficient, meshuggah, mindless, misadvised, misguided, moon-struck, moronic, myopic, napping, nitwitted, non compos, non compos mentis, nonconceiving, not all there, not bright, not right, not with it, nutty, odd, of little brain, of unsound mind, off, out of it, pea-brained, pin-brained, psycho, queer, rattlebrained, rattleheaded, rattlepated, reasonless, reckless, sappy, scatterbrained, scramblebrained, screwy, senseless, sentimental, shatterbrained, shortsighted, sick, silly, slackminded, slackwitted, stark-mad, stark-staring mad, strange, stupid, tetched, thoughtless, touched, unadvised, unaware, unaware of, unbalanced, unconscious, unconscious of, unconsidered, undiscerning, unforeseeing, ungifted, unhearing, unhinged, uninsightful, unintellectual, unintelligent, unknowing, unmindful, unmindful of, unperceiving, unprehensive, unrealizing, unreasonable, unreasoning, unreflecting, unreflective, unsane, unseeing, unsensible, unsettled, unsound, unsuspecting, untalented, unthinking, unthoughtful, unwise, unwitting, unwitty, wacky, wandering, weak-minded, wet
ignorance, nescience, tabula rasa, crass ignorance, ignorance crasse, unfamiliarity, unacquaintance, unconsciousness, darkness, blindness, incomprehension, inexperience, simplicity, unknown quantities, x, y, z, sealed book, terra incognita, virgin soil, unexplored ground, dark ages, smattering, sciolism, glimmering, dilettantism, bewilderment, incapacity, pedantry, charlatanry, charlatism, Philister, Philistine, ignorant, nescient, unknowing, unaware, unacquainted, unapprised, unapprized, unwitting, unweeting, unconscious, witless
, weetless, a stranger to, unconversant, uninformed, uncultivated, unversed, uninstructed, untaught, uninitiated, untutored, unschooled, misguided, unenlightened, Philistine, behind the age, shallow, superficial, green, rude, empty, half-learned, illiterate, unread, uninformed, uneducated, unlearned, unlettered, unbookish, empty-headed, dizzy, wooly-headed, pedantic, in the dark, benighted, belated, blinded, blindfolded, hoodwinked, misinformed, au bout de son latin, at the end of his tether, at fault, at sea, caught tripping, unknown, unapprehended, unexplained, unascertained, uninvestigated, unexplored, unheard of, not perceived, concealed, novel, ignorantly, unawares, for anything, for aught one knows, not that one knows, Int, God knows, Heaven knows, the Lord knows, who knows, nobody knows, ignorance never settles a question, quantum animis erroris inest!, small Latin and less Greek, that unlettered small-knowing soul, there is no darkness but ignorance.
imbecility folly, want of intelligence &c, want of intellect, shadowness, silliness, foolishness, imbecility, incapacity, vacancy of mind, poverty of intellect, weakness of intellect, clouded perception, poor head, apartments to let, stupidity, stolidity, hebetude, dull understanding, meanest capacity, shortsightedness, incompetence, one's weak side, not one's strong point, bias, infatuation, simplicity, puerility, babyhood, dotage, anility, second childishness, fatuity, idiocy, idiotism, driveling, folly, frivolity, irrationality, trifling, ineptitude, nugacity, inconsistency, lip wisdom, conceit, sophistry, giddiness, eccentricity, extravagance, rashness, act of folly, unintelligent, unintellectual, unreasoning, mindless, witless
, reasoningless, brainless, halfbaked, having no head, not bright, inapprehensible, weak headed, addle headed, puzzle headed, blunder headed, muddle headed, muddy headed, pig headed, beetle headed, buffle headed, chuckle headed, mutton headed, maggoty headed, grossheaded, beef headed, fat witted, fat-headed, weak-minded, feeble-minded, dull minded, shallow minded, lack- brained, rattle-brained, rattle headed, half witted, lean witted, short witted, dull witted, blunt-witted, shallow-pated, clod-pated, addle- pated, addle-brained, dim-sighted, short-sighted, thick-skulled, weak in the upper story, shallow, borne, weak, wanting, soft, sappy, spoony, dull, dull as a beetle, stupid, heavy, insulse, obtuse, blunt, stolid, doltish, asinine, inapt, prosaic, hebetudinous, childish, child-like, infantine, infantile, babyish, babish, puerile, anile, simple, old-womanish, fatuous, idiotic, imbecile, driveling, blatant, babbling, vacant, sottish, bewildered, blockish, unteachable Boeotian, Boeotic, bovine, ungifted, undiscerning, unenlightened, unwise, unphilosophical, apish, simious, foolish, silly, senseless, irrational, insensate, nonsensical, inept, maudlin, narrow-minded, bigoted, giddy, rash, eccentric, foolish, unwise, injudicious, improper, unreasonable, without reason, ridiculous, absurd, idiotic, silly, stupid, asinine, ill-imagined, ill-advised, ill-judged, ill-devised, mal entendu, inconsistent, irrational, unphilosophical, extravagant, sleeveless, idle, pointless, useless, inexpedient, frivolous, Davus sum non, a fool's bolt is soon shot clitellae bovi sunt im, fools rush in where angels fear to tread, il n' a ni bouche ni eperon, the bookful blockhead, ignorantly read, to varnish nonsense with the charms of sound.