PERFIDIOUS

PRONUNCIATION: (puhr-FID-ee-uhs)

MEANING: adjective: Treacherous; deceitful.

ETYMOLOGY: From Latin perfidus (treacherous), from per- (beyond) + fidus (faith). Earliest documented use: 1538.
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PERFILIOUS - perpetrated by one's children

PERF-ODIOUS - describing a theatrical production that is utterly repugnant (or an execrable performance by the player(s) in such a production) [or perhaps both]

PERFID-I.O.U.s - promissory notes given with no intention of redeeming them