(pathology) color blindness

difficult / hard, probably impossible

distinction, difference / classification

to distinguish, to tell one thing from another / to classify

abnormal

abnormality

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

赤, 朱, 紅, 緋: (colour) red (reddish), scarlet, crimson, vermilion (vermeil), cinnabar, ruby-red (rubeus), cherry-red, cerise, cardinal-red, carmine, wine-red, claret-red, blood-red (sanguine), coral-red, cochineal-red, rose-red (rosy, damask), brick-red, maroon, rust-red (rusty), rufous-red, gules-red, rufescent, auburn, russet.