Pronunciation change

Noun change

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 change

Positive
treachery

Comparative
none

Superlative
none

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