肆无忌惮

他肆无忌惮地撒谎

tā sìwú-jìdàn de sāhuǎng

He lies without restraint.

肆无忌惮地破坏

sìwú-jìdàn de pòhuài

To destroy without restraint.

别肆无忌惮地开玩笑

bié sìwú-jìdàn de kāi wánxiào

Don't joke around without restraint.