RichThesaurus
ultrasonic
ultrasonic
synonyms
supersonic
alacritous
express
rapid-fire
headlong
immediate
ready
breakneck
nimble
precipitate
swift
lissome
summary
prompt
agile
fleet
winged
lively
harefooted
rapid
expeditious
quick-fire
brisk
speedy
hasty
accelerated
snappy
hurried
subsonic
hypersonic
sonic
hot
ultrasonic
antonyms
halted
infrasonic
delayed
tardy
slowed