极了
jí le
Adjectives with "-ji le"
极了 after an adjective is the strongest everyday intensifier — "extremely".
Adj. + 极了
How it works
这个主意好极了 — that's a brilliant idea. Unlike 很 and 太, 极了 follows the adjective.
It's emphatic and a bit exclamatory, so it belongs in reactions rather than in measured description.
死了 does the same job for unpleasant things: 累死了, 烦死了.
Examples
zhè ge zhǔ yì hǎo jí le
这个主意好极了。
That's an excellent idea.
jīn tiān rè jí le
今天热极了。
It's extremely hot today.
wǒ lèi sǐ le
我累死了。
I'm dead tired.