Nouns

(n)quickany area of the body that is highly sensitive to pain (as the flesh underneath the skin or a fingernail or toenail)

Adjectives

(s)quick, speedyaccomplished rapidly and without delay“was quick to make friends”, “his quick reaction prevented an accident”, “hoped for a speedy resolution of the problem”, “a speedy recovery”, “he has a right to a speedy trial”
(s)flying, quick, fasthurried and brief“paid a flying visit”, “took a flying glance at the book”, “a quick inspection”, “a fast visit”
(s)agile, nimble, quick, sprymoving quickly and lightly“sleek and agile as a gymnast”, “as nimble as a deer”, “nimble fingers”, “quick of foot”, “the old dog was so spry it was halfway up the stairs before we could stop it”
(s)quick, readyapprehending and responding with speed and sensitivity“a quick mind”, “a ready wit”
(s)immediate, prompt, quick, straightawayperformed with little or no delay“an immediate reply to my letter”, “a prompt reply”, “was quick to respond”, “a straightaway denial”
(s)quick, warmeasily aroused or excited“a quick temper”, “a warm temper”

Adverbs

(r)promptly, quickly, quickwith little or no delay“the rescue squad arrived promptly”, “come here, quick!”