(n.) Want of discernment.

ableptical amaurotic benighted bereft of light blind blindfold blindfolded color-blind dark dim-sighted eyeless hemeralopic ill-advised ill-considered ill-contrived ill-devised ill-gauged ill-judged imperceptive impercipient impolitic imprudent in darkness inadvisable inconsiderate indiscreet inexpedient injudicious insensate insensible irrational mind-blind mindless misadvised misguided myopic nearsighted nonunderstanding nyctalopic purblind rayless reasonless reckless senseless shortsighted sightless spiritually blind stark blind stone-blind thoughtless unadvised unapprehending uncomprehending unconsidered unenlightened unforeseeing unobserving unperceiving unperceptive unreasonable unreflecting unreflective unseeing unsensible unsound unthinking unthoughtful unwise visionless witless