two-faced

deceitful

Inclined to mislead others

• double-dealingDeceptive practice of betrayal
• hypocriticalFeigning beliefs one lacks
• deceptiveCreating false impressions

dishonest · false · insincere · treacherous · underhanded · scheming · untrustworthy · lying · mendacious · disingenuous

traitor

One who betrays allegiance

• backstabberDisloyal pretend ally
• JudasArchetypal betrayer name
• turncoatOne who betrays allegiance

double-crosser · betrayer · snake · sellout · defector · quisling · fink · rat · informer · snitch

mask

Face-worn concealment

• pretenseDeceptive outward show
• charadeAbsurd or obvious pretense
• frontForward-facing side

veneer · disguise · act · show · persona · false face · masquerade · smokescreen · deception · feigned

cunning

Sly, scheming cleverness

• slyCleverly deceptive
• craftyCleverly deceptive
• guilefulInclined toward deception

conniving · calculating · wily · artful · devious · shrewd · foxy · slick · smooth-talking · silver-tongued

sanctimonious

Feigning moral superiority

• holier-than-thouSmugly moralistic toward others
• pharisaicalHypocritically self-righteous
• self-righteousSmugly certain of correctness

pious · lip service · double standard · moralizing · cant · tartuffery · preaching · judgmental · smug · hypocrite

• dishonestydishonesty, deceit, duplicity, lying, mendacity
• insincerityinsincerity, phoniness, fakeness, falseness, pretense
• Number Phrasesone and only, two cents, three strikes, four corners, five senses
• Untrustworthy Thingsbroken promise, fair-weather friend, snake in the grass, wolf in sheep's clothing, false prophet
• body idiomsheart of gold, heart of stone, cold heart, warm heart, soft heart
• hypocrisyhypocrisy, hypocrite, sanctimony, self-righteousness, holier than thou