Use 'peevish' to describe someone who is quickly irritated, especially by small things. The teacher was peevish with students asking too many questions.
Pro Tip 2/3
Negative Mood
'Peevish' often suggests a temporary bad mood rather than a permanent personality trait. After waiting for hours, she was understandably peevish.
Pro Tip 3/3
Not Severe
The irritation implied by 'peevish' is less intense compared to anger or fury. He gave a peevish sigh when his computer crashed again.