TWO-FACED
ADJECTIVES
1598 — JANIAN Janus-like, two-faced → obs.
..17C — BOTH-SIDES deceitful, two-faced, double-dealing → obs.
1902 — UNDERMINDED sly, deceptive, double-faced; underhand, mean, treacherous → Eng. & Amer. dial.
1910 — LAKES (OF KILLARNEY) two-faced, untrustworthy → rhyming sl. for ‘carney’
1958 — DUPLICITOUS showing duplicity, deceitful, two-faced, double-dealing
1966 — AS TWO-FACED AS A METHODIST AX two-faced, deceitful, untrustworthy → Amer. dial.
1990 — SLICKER THAN OWL SHIT two-faced, double-dealing → US sl.
NOUNS, PERSON
1888 — JANJANSY a two-faced person → Eng. dial.
1898 — COW’S TONGUE a person who is mild or harsh-spoken according to circumstance; a two-faced person; a hypocrite → Eng. & Amer. dial. (Bk.)
1943 — BADGER-BILL a hypocrite; a two-faced untrustworthy person → W. Indies sl.
Lexicophilia 