乖巧 (guāi qiǎo): ฉลาด (เด็ก)

The little girl next door is very well-behaved; she always greets her elders on her own and never runs around or makes a fuss.

The kindergarten teacher praised Xiaoming for being well-behaved, because during nap time he lay quietly in bed and did not disturb the other children.

This puppy is very well-behaved: when its owner tells it to sit, it sits, and it even brings slippers to its owner.

When my cousin was little, she was especially well-behaved; she never interrupted when adults were talking, but just sat quietly to the side reading.