unhappy

As adjectives the difference between alone and unhappy

is that alone is by oneself, solitary while unhappy is not happy; sad.

As an adverb alone

is by one's self; apart from, or exclusive of, others; solo.

As adjectives the difference between opposed and unhappy

is that opposed is acting in opposition; opposing while unhappy is not happy; sad.

As a verb opposed

is (oppose).

As adjectives the difference between grouchy and unhappy

is that grouchy is irritable; easily upset; angry; tending to complain while unhappy is not happy; sad.

As adjectives the difference between unhappy and undefined

is that unhappy is not happy; sad while undefined is lacking a definition or value.

As adjectives the difference between untoward and unhappy

is that untoward is unfavourable, adverse, or disadvantageous while unhappy is not happy; sad.

Dark is a related term of unhappy.

As adjectives the difference between dark and unhappy

is that dark is having an absolute or (more often) relative lack of light while unhappy is not happy; sad.

As a noun dark

is a complete or (more often) partial absence of light.

As adjectives the difference between heartrending and unhappy

is that heartrending is that causes great grief, anguish or distress while unhappy is not happy; sad.

As adjectives the difference between afflictive and unhappy

is that afflictive is that causes physical or mental pain while unhappy is not happy; sad.