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