self-deluding

adjective

self-de·​lud·​ing ˌself-di-ˈlü-diŋ 

-dē-

: deluding or serving to delude oneself especially concerning one's true nature, abilities, feelings, etc.

Anyone who claims the ability to sort out the intricacies of a marriage, even their own, is self-deluding.

—Fred Dickey

his self-deluding arrogance

Word History

First Known Use

1631, in the meaning defined above