No, the word "nimble" is an adjective.
You're so nimble!
The word nimble is an adjective. the adverb form is nimbly (in a nimble or agile manner).
He is very nimble when picking people's pockets.
Jennifer was a gymnast, so she was very nimble.
Elise was very nimble as she climbed up the monkey bars.
Jack
Agile
I used Wiki Answers to cheat on my homework, part of which was writing a sentence including the word "nimble".
Jack be nimble, Jack be quick, Jack jumped over the candlestick.
quick
Nimble is an adjective meaning quick and dexterous, deft, agile, or adroit, as a nimble athlete or the nimble hands of a seamstress. It is extended metaphorically to mental abilities, a nimble mind being a clever one.