IPA: /ˈpɛtɪʃnəs/
KK: /ˈpɛtɪʃnɪs/
The quality of being easily annoyed or irritated, often resulting in a bad temper or sulky behavior.
Her pettishness made it difficult for her friends to enjoy their time together.
Pettishness → It is formed from "pettish" (from Middle English *pettysh*, meaning irritable or peevish) and the suffix "-ness" (meaning the state or quality of). The word "pettishness" refers to the state of being irritable or easily annoyed.
Think of someone who is 'irritable' ('pettish') and how that describes their 'state' ('-ness') of being easily annoyed.