He is known for his duplicitous behavior in the workplace.
Il est connu pour son comportement trompeur au travail.
The teacher's warning about the student's duplicitous behavior proved true.
L'avertissement du professeur concernant le comportement trompeur de l'élève s'est avéré vrai.
It was her duplicitous behavior that finally caused her closest friends to turn away.
C'est son comportement trompeur qui a finalement poussé ses amis les plus proches à la fuir.
Through his duplicitous behavior, he made it seem like he supported the project, even as he was sabotaging everything.
Par un comportement dissimulant, il fit croire qu'il soutenait le projet, mais il sabotait tout.