adjectives
accomplished 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"
hurried and brief
"paid a flying visit"; "took a flying glance at the book"; "a quick inspection"; "a fast visit"
moving 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"
apprehending and responding with speed and sensitivity
"a quick mind"; "a ready wit"
performed with little or no delay
"an immediate reply to my letter"; "a prompt reply"; "was quick to respond"; "a straightaway denial"
easily aroused or excited
"a quick temper"; "a warm temper"