perfidious (adj.)
treacherous, unfaithful, disloyal
H8 I.ii.156[Surveyor to King Henry] Men feared the French would prove perfidious
Tem I.ii.68[Prospero to Miranda, of Antonio] that a brother should / Be so perfidious!
Tem II.ii.147[Trinculo to Stephano, of Caliban] a most perfidious and drunken monster!
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