1. most concerned with trivial or unimportant matters; most small-minded
Usage: superlative form of petty
2. most mean-spirited or spiteful in small ways
Usage: superlative form of petty

Examples

• She made the pettiest complaint about the font size being too small.
• His pettiest habit was correcting people’s grammar in casual conversation.
• The pettiest argument broke out over who should wash the dishes.
• That was the pettiest revenge I’ve ever seen someone take.
• The manager’s pettiest rule was requiring employees to ask permission for bathroom breaks.
• Even her pettiest concerns seemed to dominate every meeting.