Silly

apayasado

(playful, giggly)

bobo

(foolish, showing a lack of good sense and wisdom)

infantil

(irresponsible, showing irresponsible behaviors)

lelo

(foolish, showing a lack of good sense and wisdom)

niñito

(foolish, showing a lack of good sense and wisdom)

semiaturdido

(semiconscious)

simple

(pejorative: simple, not intelligent, unrefined)

tontito

(pejorative: simple, not intelligent, unrefined)

tonto

(foolish, showing a lack of good sense and wisdom)