out-and-out
adjective [ before noun ] uk/ˌaʊt.əndˈaʊt/ us/ˌaʊt̬.əndˈaʊt/
彻头彻尾的，十足的，完完全全的
complete or in every way; used to emphasize an unpleasant quality of a person or thing
That's an out-and-out lie! 那是个弥天大谎！
The whole project was an out-and-out disaster. 整个计划彻底搞砸了。
Synonyms: absolutedownright sheer