The word for today is…

perfidious (adjective):

: of, relating to, or characterized by perfidy – the quality or state of being faithless or disloyal

Source : Merriam -Webster

Etymology : The modern English meaning of “perfidious” remains faithful to that of its Latin ancestor, perfidus, which means “faithless.” English speakers have used “perfidious” to mean “treacherous” since at least 1572. One of the earliest known uses of the term can be found in Act V, scene iii of Shakespeare’s All’s Well That Ends Well: the “perfidious slave” Parolles is thought to be an unreliable witness; he’ll say whatever suits his purpose, whether true or not. In contemporary usage, “perfidious” not only implies treacherousness, but an inability to be reliable or honorable.

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David is a retired surgeon originally from London who came to New Zealand twenty-seven years ago after being delayed in Singapore for thirteen years on leaving the UK. He was coerced into studying Latin...