
Grumpy
Negative Emotion
Grumpy suggests a temporary mood, not a permanent trait, often due to specific reasons.
He's not always so grumpy; he's just tired today.
Not Serious
Grumpy can imply a less serious, more tolerable level of annoyance than outright anger.
She gets grumpy before her morning coffee, but it passes quickly.
Informal Usage
The term 'grumpy' is informal, so use it in casual conversations rather than formal contexts.
My little brother is grumpy when he doesn't get enough sleep.