Used to describe someone who won't stop until they get what they want, often annoyingly so. The importunate salesman wouldn't leave until I closed the door.
Pro Tip 2/3
Negative Connotation
Often implies that the persistence is unwelcome or uncomfortable for others. His importunate requests for feedback began to irritate the team.
Pro Tip 3/3
Intensity of Demand
Shows strong emphasis on the intensity and continual nature of the demands. Her importunate pleas for assistance made it clear she was desperate.