treachery

What it means

1. countableuncountableDeliberate, often calculated, disregard for trust or faith.

   Suddenly, in the midst of high-camp treachery and sleuthery, each character does a star turn, breaking out in song.

   2002 January 3, Joan Dupont, “MOVIE GUIDE : 8 Femmes”, in The New York Times

2. countableuncountableThe act of violating the confidence of another, usually for personal gain.
3. countableuncountableTreason.

   Synonyms: perfidy

In a sentence

Suddenly, in the midst of high-camp treachery and sleuthery, each character does a star turn, breaking out in song.

2002 January 3, Joan Dupont, “MOVIE GUIDE : 8 Femmes”, in The New York Times

Where it comes from

1. Old Frenchtricherie
2. Middle Englishtrecherie
3. Englishtreachery

From Middle English trecherie, from Old French tricherie, trecherie, from tricher, trichier (“to cheat”).