Answer: keen

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