Meaning of しつこく in Japanese

When I reached the hall right away the person in charge unrelentingly said things like "This painting is certain to increase in value in the future," and I went and signed the contract.

Crude persuasion is to persistently egg someone on.

They importune their parents for money.

They were urgent in their demand.

He pressed me for a prompt reply.

He was urgent in insisting that she call the doctor.

He deliberately kept on provoking a confrontation.

He was hounded into quitting.

That salesman was persistent in asking me to buy a car.

The telephone on my desk rang persistently and loudly.