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countable and uncountable, plural treacheries
Deliberate, often calculated, disregard for trust or faith. examples
The act of violating the confidence of another, usually for personal gain. examples
Treason. examples
(countable) An act or instance of treachery. quotations examples
These submerged treacheries left an atmosphere. Even two such practised obliterators of their species as Bradly and Podson could not fail to note that each was secreting a certain reservation of opinion on the other.
1938, Norman Lindsay, Age of Consent, 1st Australian edition, Sydney, N.S.W.: Ure Smith, published 1962, page 78