1. a person who insists on something; one who demands or maintains something firmly

Examples

• She was a persistent insister on proper grammar in all written work.
• The coach was an insister on daily practice, even during holidays.
• As an insister on punctuality, he arrived fifteen minutes early to every meeting.
• The teacher was known as an insister on complete silence during tests.
• He proved to be quite the insister when it came to following safety protocols.
• The manager was an insister on detailed reports from all department heads.