Origin: Latin suffix -ous
Duplicitous has 2 different meanings across 1 category:
marked by deliberate deceptiveness especially by pretending one set of feelings and acting under the influence of another
"she was a deceitful scheming little thing"
"a double-dealing double agent"
"a double-faced infernal traitor and schemer"
Given to or marked by deliberate deceptiveness in behavior or speech.