彻头彻尾 (chè tóu chè wěi) — thoroughgoing, out-and-out, to the core (often…

Definition

这个成语字面意思是“从头到尾”，但实际用作强调完全、彻底地具有某种性质，常带有贬义或夸张色彩。你可以在形容词前使用它来加强语气，比如“彻头彻尾的失败”表示彻底的失败。

thoroughgoingout-and-outto the core (often negative connotation)

彻头彻尾。
Tā shì yí ge chè tóu chè wěi de piànzi.
He is an out-and-out liar.
彻头彻尾。
Zhè chǎng gǎigé shì chè tóu chè wěi de shībài.
This reform was a thoroughgoing failure.
彻头彻尾。
Tā de xiǎngfǎ chè tóu chè wěi de guòshí le.
His ideas are through and through outdated.