Unhappy, sad, down in spirit.
The adjective dejected means unhappy, disappointed, or depressed because of failure or an undesirable outcome.
To be unhappy or dejected, low in spirits.
They were dejected after losing the battle.
sad, blue, unhappy, discouraged, mournful, dejected, despondent
I am dejected (disheartened) by your answer to my question.
depressed, low, sad, unhappy, melancholy, dejected, despondent, downcast
Other words for sad include unhappy, depressed, melancholy, sorrowful, dejected, despondent. There are numerous other synonyms for it too.
He felt very dejected when his parents divorced.
I feel so dejected because I lost a game Deena nawas
Unhappy is not a compound word. The word unhappy is a root word plus a prefix.
I feel dejected about my uncle.
Another word for unhappy is sad.