unhappy

Unhappy is a synonym of melancholy.

As adjectives the difference between melancholy and unhappy

is that melancholy is affected with great sadness or depression while unhappy is not happy; sad.

As a noun melancholy

is black bile, formerly thought to be one of the four "cardinal humours" of animal bodies.

As adjectives the difference between frustrated and unhappy

is that frustrated is foiled, stopped, disappointed while unhappy is not happy; sad.

As a verb frustrated

is past tense of frustrate.

As adjectives the difference between unhappy and unhappied

is that unhappy is not happy; sad while unhappied is (obsolete) made unhappy.

As adjectives the difference between unhappy and mishappy

is that unhappy is not happy; sad while mishappy is (rare) unfortunate; unhappy.

As adjectives the difference between unhappy and unglad

is that unhappy is not happy; sad while unglad is (archaic) not glad; unhappy, joyless.

As an adjective unhappy

is not happy; sad.

As a noun wanweird is

misfortune; ill or unhappy fate.

As adjectives the difference between unhappy and unfelicitous

is that unhappy is not happy; sad while unfelicitous is not felicitous; unhappy, unfortunate.

As an adjective unhappy

is not happy; sad.

As a noun miserabilist is

one who is unhappy, or extols being miserable as a virtue; a philosopher of pessimism.