no doubt
used to emphasize that what you are saying is true or likely to happen:
We will, no doubt, discuss these issues again at the next meeting.
No doubt you'll want to unpack and have a rest before dinner.

[TahlilGaran] Advanced Learner's Dictionary ▲

no doubt
1.
certainly.
No doubt you have already heard about the terrible storm we just had, but did you know it blew down the steeple of the old church?

Usage notes: sometimes used in the form without (a) doubt, with the same meaning:
Without doubt, he is the funniest man I know.

2.
probably.
The schools should no doubt spend twice as much on teachers as they do now.

[TahlilGaran] English Idioms Dictionary ▲

no doubt
without doubt, surely, certainly
No doubt he will be the one to win the contest again this year.

[TahlilGaran] English Idioms Dictionary ▲

no doubt
adv.
1. Without doubt; doubtless; surely; certainly.
No doubt Susan was the smartest girl in her class.
2. Probably.
John will no doubt telephone us if he comes to town.

[TahlilGaran] English Idioms Dictionary ▲