unexpected and sudden

happening suddenly and unexpectedly

(of work, reading etc) done without attention to details

casual, hasty

(capable of) acting, moving etc, taking a short time

speedy

said, made or done (too) quickly

speedy; without much thought

with the head first; thoughtless(ly) and hurried(ly)

dangerous, reckless

(done) in a hurry and without organization; a tall spiral slide in a fairground etc

with undue hurry and confusion

done, acting, quickly and without enough thought or care

acting without thinking

(of an activity, movement) done in a short time; enthusiastic and intelligent

fast, speedy

moving, happening, very quickly

very quick

never still or quiet

not content; moving about

happening unexpectedly, quickly, without warning

unexpected; happening quickly

of or on the surface only; not thorough or deep

without depth, detail

(of speed) faster that that of sound; (of a plane) able to fly at supersonic speed

fast, quick

quick to happen; fast; a kind of small bird with long wings, similar to a swallow

very fast

(of sound waves) above normal human hearing

fast, quick