Answer: keen

AnswerCrossword Clue
KEEN

Intellectually sharp

KEEN

Loud wail

KEEN

Sharp

KEEN
Peachy-..
KEEN
Sharp as a tack
KEENSharp-edged
KEENSplendid, slangily
KEENDiscerning
KEENAstute
KEENFresh from honing
KEENBlunt's antonym
KEENPerceptive
KEENAcute
KEENNifty
KEENEnthusiastic
KEENOld-school "rad"
KEENWith hot enthusiasm
KEENRazor-sharp
KEENZealous
KEENAcute, as vision
KEEN"Peachy-..!"
KEENMentally adept
KEENNeato
KEENFinely honed
KEENMentally acute
KEENVery sharp, as wit
KEENInsightful
KEENQuick-witted
KEEN"Neato!"
KEENLike an eagle's vision
KEENFinely sharpened
KEENGung-ho
KEENNot dull
KEENEager or enthusiastic
KEENFierce, like competition
KEENPeachy follower
KEENWail
KEENEager
KEENVery sensitive
KEENAvid