利口(りこう)clever, intelligent, wise, bright, sharp, sensible, smart, shrewd, well-behaved (of kids, animals, etc), obedient, good, good (with words)

東大(とうだい)に通(かよ)っている生徒(せいと)はみんな利口(りこう)だ。

All students attending Tokyo University are intelligent. {clever, intelligent, wise, bright, sharp, sensible, smart, shrewd, well-behaved (of kids, animals, etc), obedient, good, good (with words)}

ボーダーコリーは利口(りこう)な犬(いぬ)として有名(ゆうめい)である。

The Border Collie is famous for being a smart dog. {clever, intelligent, wise, bright, sharp, sensible, smart, shrewd, well-behaved (of kids, animals, etc), obedient, good, good (with words)}

利口(りこう)に立(た)ち回(まわ)ったので社内(しゃない)で出世(しゅっせ)することが出来(でき)ました。

Because I acted cleverly, I was able to get promoted within the company. {clever, intelligent, wise, bright, sharp, sensible, smart, shrewd, well-behaved (of kids, animals, etc), obedient, good, good (with words)}

母(はは)が娘(むすめ)に：「お利口(りこう)さんにしていたらお菓子(かし)を買(か)ってあげるわよ。」

Mother says to her daughter: "If you behave well, I'll buy you some sweets." {clever, intelligent, wise, bright, sharp, sensible, smart, shrewd, well-behaved (of kids, animals, etc), obedient, good, good (with words)}

社長(しゃちょう)の服装(ふくそう)に乱(みだ)れが生(しょう)じているが、これは黙(だま)っている方(ほう)が利口(りこう)だろう。

The president's attire is disheveled, but it would be wise to stay silent about it. {clever, intelligent, wise, bright, sharp, sensible, smart, shrewd, well-behaved (of kids, animals, etc), obedient, good, good (with words)}