livelier , liveliest
You can describe someone as lively when they behave in an enthusiastic and cheerful way.
She had a sweet, lively personality.
她性格活泼可爱。
A lively event or a lively discussion, for example, has lots of interesting and exciting things happening or being said in it.
It turned out to be a very interesting session with a lively debate.
结果这成了一次辩论激烈、非常有意思的会议。
Someone who has a lively mind is intelligent and interested in a lot of different things.
She was a very well educated girl with a lively mind, a girl with ambition.
她是一个非常有教养、头脑活跃、有抱负的女孩。