利口だね。
Words
利口
(りこう)
clever; intelligent; wise; bright; sharp; sensible; smart; shrewd; well-behaved (of kids, animals, etc); obedient; good; good (with words)
だ
(だ)
be; is; indicates past or completed action; indicates light imperative
ね
(ね、ねえ)
indicates emphasis, agreement, request for confirmation, etc.; is it so; hey; come on; listen; not