From The Collaborative International Dictionary of English v.0.48 [gcide]:
Agile \Ag"ile\, a. [F. agile, L. agilis, fr. agere to move. See
Agent.]
Having the faculty of quick motion in the limbs; apt or ready
to move; nimble; active; as, an agile boy; an agile tongue.
[1913 Webster]
Shaking it with agile hand. --Cowper.
[1913 Webster]
Syn: Active; alert; nimble; brisk; lively; quick.
[1913 Webster]
From WordNet (r) 3.0 (2006) [wn]:
agile
adj 1: 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" [syn: agile, nimble,
quick, spry]
2: mentally quick; "an agile mind"; "nimble wits" [syn: agile,
nimble]