十二分 (shí'èrfēn): exceedingly; 120 percent

Meanings

Wǒ duì tā de biǎoxiàn shí'èrfēn mǎnyì.

I'm absolutely 120 percent satisfied with his performance.

Zuò zhè zhǒng shǒushù bìxū shí'èrfēn xiǎoxīn.

An operation like this requires the utmost care.

usage

Stronger than 十分 (very). Think of it as dialing past 100 percent: '十二分 + adjective' means beyond full, absolutely maxed out.

十 shí

二 èr

分 fēn