bolond

• tomfoolery

• bozo, coot, fool, nut, wacko, whacko

• off the beam

• piffle

• pantaloon

• off his chump

• stark staring mad

• desperate fool, he's a proper fool

• court clown, court jester, jester

• veriest fool

• you are a something fool

• cockeyed, cracked, dorky, fey, freaky, hare-brained, harebrained, he is bats, pixilated, scatty, screwy, to be cracked, way-out, wayout, zany

• to bamboozle

• rollicker, waggish

• lunacy

• with a hop skip and a jump

• crank

• booby-hatch, crazyhouse, loonybin

• to cod, to gouge

• to kid, to stultify

• sot