Dictionary / Vocabulary / 世慣れる
よなれる
to become used to the (ways of the) world; to become worldly or sophisticated
Also written 世馴れる
彼は年の割にとても世慣れて見える。
He looks quite sophisticated for his age.
彼は世慣れた人だ。
He is a man of the world.
彼はとても世慣れているが、まだ非常に若い人です。
Though he is so worldly-wise, he is still very young.