ambidextrous
deceitful
double-dealing
duplicitous
Janus-faced
two-faced
double-faced
double-tongued
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
Israel Zangwill
a double-dealing double agent
a double-faced infernal traitor and schemer
W.M.Thackeray