1. most complaining or whining; most given to expressing dissatisfaction
Usage: informal; superlative form of kvetchy

Examples

• He was the kvetchiest customer the restaurant had ever served.
• During the camping trip, she became the kvetchiest member of the group.
• The kvetchiest passengers always seem to sit near me on flights.
• Even on vacation, he remained the kvetchiest person in our family.
• The kvetchiest reviews often reveal more about the reviewer than the product.