Doubtless means likely, probably, almost certainly. "My name is Bond. James Bond. Doubtless you have heard of me."

It was doubtless that they intended to proceed with their mission.

"It was doubtless they would have to attend the class."

Doubtless there is a firm called Gerber somewhere.

Doubtless many questions appear 'dumb' when you know the answer.

Doubtless many 'dumb' children ask unnecessary questions. The reasons they do so are as varied as those that ask them.