treach·ery 
/ˈtrɛtʃəri/ noun
plural treach·er·ies /ˈtrɛtʃəri/ noun 1 [noncount] : harmful things that are done usually secretly to a friend, your own country, etc.
▪ a tale of treachery and revenge 2 [count] : an act of harming someone who trusts you
▪ She was deeply hurt by her husband's treacheries. [=her husband's treacherous acts]
▪ a tale of treachery and revenge
▪ She was deeply hurt by her husband's treacheries. [=her husband's treacherous acts]
