obsessive.

Occupied with a thought or activity so persistently that other concerns are crowded out.

Use it for

Words that belong together

• obsessive attention
• obsessive concern

On the page

His obsessive attention to the timetable distracted him from the route.

Usage notes

Primary category: psychology / human behavior. Forms: Comparative more obsessive; superlative most obsessive when comparison is meaningful. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings. Established modern English lexical item. No separate regional spelling or grammatical inflection entry. Writing functions: character, behavior. Commonness: moderately common.