Princeton's WordNet

1. unhappy(adj)

   experiencing or marked by or causing sadness or sorrow or discontent

   "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"; "he looks so sad"

2. dysphoric, distressed, unhappy(adj)

   generalized feeling of distress

3. unhappy(adj)

   causing discomfort

   "the unhappy truth"

4. infelicitous, unhappy(adj)

   marked by or producing unhappiness

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

Kernerman English Learner's Dictionary

1. unhappy(adjective)ʌnˈhæp i

   sad, not content

   She looked so unhappy sitting by herself.; an unhappy marriage

2. unhappyʌnˈhæp i

   disappointed or dissatisfied

   unhappy with the way she had been treated; He stared unhappily out of the window.; unhappiness at work; public unhappiness with air fares

Wiktionary

1. unhappy(Adjective)

   Not happy; sad.

2. unhappy(Adjective)

   Not satisfied; unsatisfied.

3. unhappy(Adjective)

   Not lucky; unlucky.

4. unhappy(Adjective)

   Not suitable; unsuitable.

Webster Dictionary

1. Unhappy(adj)

   not happy or fortunate; unfortunate; unlucky; as, affairs have taken an unhappy turn

2. Unhappy(adj)

   in a degree miserable or wretched; not happy; sad; sorrowful; as, children render their parents unhappy by misconduct

3. Unhappy(adj)

   marked by infelicity; evil; calamitous; as, an unhappy day

4. Unhappy(adj)

   mischievous; wanton; wicked

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