活动to be wobbly
人上了年纪，牙齿也有点活络了。
As people get older, their teeth become loose.
不确定；灵活uncertain; flexible
他说得很活络，不知道究竟肯不肯去。
He was rather non-committal. I'm not sure if he's going or not.
小伙子头脑活络。
That young man has a nimble mind.
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