Answer: QUICK

AnswerCrossword Clue
QUICKPretty smart
quickalert
quickto injure deeply; hurt the feelings of
quickpart of the fingernail flesh / speedy (swift (speedy))
quickswift
quicksensitive flesh under the nails
quickliving persons
quickprompt; done promptly
quickin a quick manner
QUICKArea under a nail
QUICKLike the "brown fox"
QUICKApt
QUICKWink-link
QUICKRapid-fire
QUICKLike winks
QUICKMentally agile
QUICKSpeedy
QUICKImpulsive.
QUICKLiving persons (with "the").
QUICKSharp-witted
QUICKFast on one's feet
QUICKFast
QUICKClever