Pronunciation

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Singular
treachery

Plural
treacheries

  1. (uncountable) Treachery is behaviour which cannot be trusted: to break faith or betray.
    King John was known for his treachery.

Adjective

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Positive
treachery

Comparative
none

Superlative
none

  1. Treacherous
    His behaviour was treacherous.
    Sometimes the weather is treacherous.