Learner's definition of UNHAPPY
[or more unhappy; most unhappy]
1 : sad, depressed, or disappointed : not happy
— often + with — often + about — often + that
I can see that he's unhappy, but I don't know why.
I've never seen her looking so unhappy.
I left the store an unhappy [=unsatisfied] customer.
2 : causing or involving feelings of sadness : not pleasant or joyful 3 : not appropriate or lucky