The Collaborative International Dictionary
Double-faced \Dou"ble-faced`\, a.
Having two faces designed for use; as, a double-faced hammer.
Deceitful; hypocritical; treacherous.
--Milton.
Wiktionary
a. 1 Having two functional faces. 2 deceitful; hypocritical; treacherous
WordNet
adj. (of fabrics) having faces on both sides; "damask is a double-faced fabric"
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 [syn: ambidextrous, deceitful, double-dealing, duplicitous, Janus-faced, two-faced, double-tongued]
Usage examples of "double-faced".
Here was the antlered figure of Guthlac, and the double-faced head of Simyits, a harp for Garin, the patron of harpers, and shears for Dort, the patron of sheepshearers and all in the wool trade.
She wore a suit of double-faced ivory silk with trapunto trim densely stitched in real gold thread.