deception

noun
de*cep*tion \ di-ˈsep-shən \
15th century{ds||1|a|}
  • the act of causing someone to accept as true or valid what is false or invalid : the act of deceiving
  • the fact or condition of being deceived
  • something that deceives : trick

self-deception

noun
self-de*cep*tion \ ˌself-di-ˈsep-shən \
1648
  • the act or an instance of deceiving oneself or the state of being deceived by oneself especially concerning one's true nature, feelings, etc.

practice deception on

idiom
practice deception on \
  • to make (someone) believe something that isn't true : to deceive
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