adjective nimbler, nimblest
1 Quick and light in movement or action; agile.
1.1 (of the mind) able to think and understand quickly.
Old English nǣmel ‘quick to seize or comprehend’, related to niman ‘take’, of Germanic origin. The -b- was added for ease of pronunciation.
Crossing the mountain’s steep rock slopes, with no observable slips, mountain goats are the epitome of being nimble.