pertinacious.

Holding firmly to a purpose or position despite resistance.

Use it for

Words that belong together

• pertinacious pursuit
• pertinacious advocate

On the page

His pertinacious pursuit lasted years.

A pertinacious advocate kept the issue alive.

Usage notes

Primary category: literary. Forms: Comparative more pertinacious; superlative most pertinacious where gradation is meaningful. Legacy lexical fields mirror sense 1 only. Use numbered sense fields for all meanings.