Pettish
/ˈpetɪʃ/
Definition 1 of 1
Pro Tip 1/3Slight Irritation
'Pettish' implies a minor annoyance or irritability, not extreme anger. 
She responded in a pettish tone, clearly annoyed by the trivial interruption.
Pro Tip 2/3Common Misuse
Do not confuse 'pettish' with 'petty.' 'Pettish' describes behavior, 'petty' often describes actions or things. 
His pettish behavior at the party was due to unimportant reasons, but it wasn't right to call his concerns petty.
Pro Tip 3/3Mood Context
Use 'pettish' to describe temporary moods or attitudes, not someone’s overall personality. 
After missing her coffee, she was pettish all morning but returned to her cheerful self by lunchtime.