dreadful (adjective) dreadful: horrible, frightening
Sinonime: break up,
burst*, cachinnate, chortle, chuckle, convulsed, crack up, crow, die laughing, fracture, giggle,
grin, guffaw,
howl,
roar, roll in the aisles,
scream,
shriek, snicker, snort, split one's sides, titter, whoop, with sound be in stitches
Antonime: cry