Grump
Definition 1 of 2

Humor
Using 'grump' can lighten the mood in a tense conversation.

'He’s just being a grump today.'
Context
It's often used to describe someone temporarily in a bad mood.

'Don’t mind her, she’s just a grump before her coffee.'
Colloquial
More commonly used in informal settings, so avoid in formal writing.

'He tends to grump when things don’t go his way.'
Compare with
grouchcurmudgeoncomplainwhine
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