1. superlative form of aunty; most resembling or characteristic of an aunt in manner, appearance, or behavior
Usage: informal; chiefly British

Examples

• She wore the auntliest cardigan at the family gathering.
• His auntliest mannerisms made the children laugh.
• That was the auntliest advice I've ever received.
• The auntliest hairstyle was popular in the 1980s.