self-deception
Concise Oxford English Dictionary © 2008 Oxford University Press:
self-deception
▶noun the action or practice of deceiving oneself into believing that a false or unvalidated feeling, idea, or situation is true.
– derivatives
self-deceit noun,
self-deceiver noun,
self-deceiving adjective,
self-deceptive adjective.
self-deceit noun,
self-deceiver noun,
self-deceiving adjective,
self-deceptive adjective.
'self-deception' also found in these Oxford entries:

