monomania

Example:Ever since winning the lottery, he fell into a mania of buying everything in sight.

Definition:An overwhelming urge to engage in some activity.

Example:Her obsessions about cleanliness made it nearly impossible for her to interact socially.

Definition:The persistence of an idea or image in the mind to an irrational or excessive degree.

Example:Not correcting my mistakes was my conceit, and it got me into trouble.

Definition:A foolish devotion to one’s own ideas.