不亦乐乎

bù yì lè hū

what a delight; (after 得) to the utmost

Character by character

不bù
not

亦yì
also

乐lè
a joy

乎hū
?

孩子们在雪地里玩得不亦乐乎。

The children were having the time of their lives in the snow.

Tone: neutral.

From 有朋自远方来，不亦乐乎. Today mostly 忙得不亦乐乎, 玩得不亦乐乎.

Learn this in Lesson 206 · HSK 9+: 文言入门：之乎者也 (Classical Chinese: the four little words)

A dialogue, a reading, word cards with audio and a drill that uses it, in Learn Chinese with Bao. This lesson is free.