Learner's definition of SURELY
2 a : without a doubt
b — used in negative statements to show surprise that something could be true
He will surely be missed.
This is surely the best dessert you have ever made.
Surely you must admit that it was a good decision.
“Are they going to get away with it?” “Surely not.”
Surely you don't think that we are responsible for this!
Surely you haven't forgotten my name!