discontent

Short definition from Wiktionary

Noun

1. 1
   Dissatisfaction.
2. 2
   A longing for better times or circumstances.
3. 3
   A discontented person; a malcontent.

Verb

1. 1
   To deprive of contentment; to make uneasy; to dissatisfy.

Adjective

1. 1
   Not content; discontented; dissatisfied.