1. most strange, eccentric, or unconventional in behavior or appearance
Usage: informal; superlative form of kooky

Examples

• She wore the kookiest outfit to the party, complete with mismatched shoes and a feather hat.
• That’s the kookiest idea I’ve ever heard, but it might actually work.
• My uncle is the kookiest person in our family, always inventing strange gadgets.
• The kookiest character in the movie was the talking parrot who solved mysteries.
• Even among the eccentric artists, she had the kookiest painting style.
• His kookiest habit is collecting vintage lunch boxes from the 1960s.