蛮干

wǒ men yào shí gàn qiǎo gàn bù néng mán gàn

我们要实干巧干，不能蛮干。

We should work hard and intelligently, not blindly.

máng mù mán gàn

盲目蛮干

act with blind recklessness

nà chún cuì shǔ yú mán gàn

那纯粹属于蛮干。

That's downright foolhardy.

wǒ men bù kě yǐ mán gàn

我们不可以蛮干。

We must not rush headlong into things.

tǎo lùn huì bǐ mán gàn yào yǒu yòng

讨论会比蛮干要有用。

Discussion can be more effective than the use of brute force.

mán gàn shì yào chī kǔ tou de

蛮干是要吃苦头的。

If you act rashly, you'll suffer for it.