An unhappy customer is unlikely to return to your shop.
(chiefly dated) Not lucky; unlucky.
The doomed lovers must have been born under an unhappy star.
(chiefly dated) Not suitable; unsuitable.
noun
A person who is not happy.
Leduc, as is true of many other unhappies, is largely a confessional writer: her subject is herself, and her gift is a driving, vivacious power that turns her incurable, inveterate unhappiness into a series of dramas […]