daffiest

Maximally silly behaving

Daffiest is the superlative form of daffy, meaning the most silly, scatterbrained, or amusingly eccentric: She was the daffiest of the three sisters, always losing her keys and talking to houseplants.

The word carries affection rather than criticism—daffy people are endearingly foolish, not irritatingly so.

silly

clownish

Comically foolish in behavior

harebrained · frivolous · giddy · dizzy · flaky · kooky · nutty · wacky · batty · cuckoo

absurd

nonsensical

Without coherent meaning

illogical · irrational · unreasonable · ridiculous · outlandish · grotesque · surreal · paradoxical · improbable · unbelievable

playful

carefree

Free from anxiety

breezy · blithe · jovial · merry · frolicsome · jocular · effervescent · vivacious · sprightly · gleeful

eccentric

quirky

Idiosyncratically unusual

peculiar · oddball · singular · unorthodox · bohemian · maverick · nonconformist · original · avant-garde · esoteric

Opposites
mental soundness/rationality

daffiestsanest

Most mentally sound

wisest · shrewdest

behavioral seriousness

daffiestgravest

Most serious or critical

stuffiest

behavioral conventionality

daffieststaidest

Superlative of serious-minded

dullest

Family

daffier

Familiarity
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Used worldwide · Timeless · Abstract · Positive · Everyday, not technical · Rated G