不堪设想

nǐ bù gǎi xián gēng zhāng hòu guǒ bù kān shè xiǎng

你不改弦更张，后果不堪设想。

If you don't mend your ways, the consequences will be disastrous.

rú guǒ jiān chí cuò wù nà qián tú jiù bù kān shè xiǎng

如果坚持错误，那前途就不堪设想。

If one persists in one's errors, one will not have much of a future.

hé xiè lòu zào chéng de hòu guǒ bù kān shè xiǎng

核泄漏造成的后果不堪设想。

The consequences of a nuclear leak don’t bear thinking about.

rú guǒ zài wù tiān zhōng qì chē zài kāi kuài diǎn hòu guǒ bù kān shè xiǎng

如果在雾天中汽车再开快点，后果不堪设想。

A fast car in such a fog would have ended in a disaster.

zhàn zhēng yī chù jí fā hòu guǒ bù kān shè xiǎng

战争一触即发，后果不堪设想。

A war seems inevitable and the consequences will be catastrophic.