sì肆unrestrainedwú无withoutjì忌feardàn惮scruples
unscrupulous and unrestrained; to act with absolutely no constraint
Literal meaning
unrestrained (肆) — without (无) — fear (忌) — scruples (惮)
Origin
A classical four-character phrase.
Examples
Tā他sì肆wú无jì忌dàn惮de地pī批píng评le了lǎo老bǎn板de的jué决dìng定。
He criticized the boss's decision without any restraint.
Zhè这xiē些piàn骗zi子sì肆wú无jì忌dàn惮de地qī欺piàn骗lǎo老nián年rén人。
These scammers unscrupulously cheat the elderly.
Usage & nuances
Often used in a negative context to describe someone's bad behavior.
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