1. (verb) be persistent, refuse to stop

• hang on
• hold on
• persevere
• persist

1. (verb) be persistent, refuse to stop

• ask for it
• ask for trouble
• follow
• stick to
• stick with
• obstinate
• plug
• plug away

1. (verb) be persistent, refuse to stop

• bear on
• carry on
• continue
• preserve
• uphold

1. (verb) be persistent, refuse to stop

• doggedness
• perseverance
• persistence
• persistency
• pertinacity
• tenaciousness
• tenacity
• perseverance
• perseverance
• perseverance
• perseveration
• perseveration
• perseveration
• persistence
• persistence
• persistence
• perseveration
• persistent
• relentless
• unrelenting