unhappy
1. [ adjective ] experiencing or marked by or causing sadness or sorrow or discontent
Synonyms: sad
Examples:

"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"

Related terms: happy bad miserable homesick lovesick sad sorrowful dysphoric discontented dejected infelicitous joyless cheerless happiness happiness
2. [ adjective ] generalized feeling of distress
Synonyms: distressed dysphoric
Related terms: euphoric dejected
3. [ adjective ] causing discomfort
Examples:

"the unhappy truth"

Related terms: unpleasant
4. [ adjective ] marked by or producing unhappiness
Synonyms: infelicitous
Examples:

"infelicitous circumstances" "unhappy caravans, straggling afoot through swamps and canebrakes"- American Guide Series

Related terms: unfortunate