blindness(n = noun.state) cecity, sightlessness - the state of being blind or lacking sight;
is a kind of vision defect, visual defect, visual disorder, visual impairment
has particulars: legal blindness, anopia, snow-blindness, snowblindness, eyelessness, figural blindness
Derived form adjective blind₁

   State or condition of being blind, literally or figuratively. Darwin. [1913 Webster]

N  blindness, cecity, excecation, amaurosis, cataract, ablepsy, ablepsia, prestriction, dim-sightedness, Braille, Braille-type, guttaserena (drop serene), noctograph, teichopsia, blind, eyeless, sightless, visionless, dark, stone-blind, sand- blind, stark-blind, undiscerning, dimsighted, blind as a bat, blind as a buzzard, blind as a beetle, blind as a mole, blind as an owl, wall-eyed, blinded, blindly, blindfold, blindfolded, darkly, O dark, dark, dark, amid the blaze of noon.

N  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.

color blindness, colour blindness, day blindness, figural blindness, moon blindness, night blindness, red-green color blindness, red-green colour blindness, river blindness, word blindness, yellow-blue color blindness