monomania.

An intense, persistent preoccupation with one subject, aim, or idea.

Use it for

Words that belong together

• monomania about a subject
• a consuming monomania

On the page

The search for the lost portrait had become a monomania.

His monomania left no room for friendship or ordinary work.

Usage notes

Primary category: horror. Forms: Usually uncountable; plural monomanias for distinct fixations. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.