the.com/duplicity
Lying so polished it ships in two faces, both smiling.
means Deceptive behavior where someone says one thing while secretly intending or doing another.
from From Latin duplex, two-fold — literally being doubled, as in a person folded into two contradictory selves.
Legal lifeIn law, one charge wrongly accusing two offenses at once.
Cousin wordShares roots with duplex and duplicate, all twos.
Numerical insultSingle-mindedness is honest; two minds here means betrayal.