agile: dexterity and ease in physical or mental actions: ~ at answering questions on a variety of issues.


nimble: stresses lightness and swiftness of action or thought: a ~ tennis player.


brisk: sug. liveliness, animation, or vigor and sometimes with a suggestion of hurry: a ~ cleaning-UP before the relatives arrived.


spry: stresses unexpected quickness because of old age or known infirmity: ~ older players beating  younger opponents.


agile：娴熟轻松(dexterous娴熟轻松2017-12-20)，强调娴熟, nimble: 轻快(重量)轻松，强调轻快, brisk: 活力(标红live,anim,vig都和生命相关), 有时表示匆忙，spry:出乎意料的快速（如老弱）。


记忆方法： 1）首字母联想ANBS: NBA Shooter，一个NBA投球手,动作轻快

          2）swift表示with ease,因此前两个词agile和nimble都表轻松。brisk强调活力，spry强调出乎意料。

          3）敏捷的意思是行动行为轻松快速mean acting or moving with easy quickness.