1(esp. of a child) sensible; thoughtful; intelligent
2to grow beyond the naivete of childhood; to be aware of what is going on in the world
Examples
wǒ我jué de觉得nǐ你shì是shí hou时候gāi该dǒng shì懂事le了。
我觉得你是时候该懂事了。
I think it's time for you to grow up.
她年纪够大该懂事了。
She is old enough to know better.
你们这些家伙真不懂事。
You guys are totally clueless.