Someone who is nimble is able to move their fingers, hands, or legs quickly and easily.
e.g. Everything had been stitched by Molly's nimble fingers...
e.g. Val, who was light and nimble on her feet, learnt to dance the tango.
Sabrina jumped nimbly out of the van...
Uncle George quickly descended the ladder and nimbly stepped aboard.
If you say that someone has a nimble mind, you mean they are clever and can think very quickly.
e.g. A nimble mind backed by a degree in economics gave him a firm grasp of financial matters...
e.g. Elderly people are told that if they want to keep their minds nimble, they must use them.