/ˈfʌnɪst/; /ˈfʌnɛst/ (nonstandard)

Definitions

1. adjective

superlative form of fun, used to compare two or more things

“This party is the funnest I’ve been to all year.”

2. adverb

used to emphasize a comparison or to express a high degree of an activity

“She is having a funnest time at the amusement park.”