experiencing or marked by or causing sadness or sorrow or discontent; "unhappy over her departure"; "unhappy with her raise"; "after the argument they lapsed into an unhappy silence"; "had an unhappy time at school"; "the unhappy (or sad) news"; "he looks so sad"
not meeting requirements; "unequal to the demands put upon him"
(followed by `of') lacking capacity or ability; "incapable of carrying a tune"; "he is incapable of understanding the matter"; "incapable of doing the work"
(followed by `of') not having the temperament or inclination for; "simply incapable of lying"
lacking the necessary skill or knowledge etc.; "an incapable helper"