petulant

Choose the adjective petulant to describe a person or behavior that is irritable in a childish way.

The adjective, petulant, is a disapproving term used to describe a bad-tempered child, an adult behaving like an angry child or behavior of this type. Angry or annoyed mean the same thing, but if you choose the word, petulant, you are indicating that it is unreasonable or unjustified. Petulant came to English in the late 16th century from the Latin petulantem "forward, insolent" but was not recorded to mean childishly irritable until the late 1700s.

Definitions of petulant
  1. adjective
    easily irritated or annoyed
    synonyms: cranky, fractious, irritable, nettlesome, peckish, peevish, pettish, scratchy, techy, testy, tetchy
    ill-natured
    having an irritable and unpleasant disposition
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