What is the opposite of surely?

The opposite of "surely" depends on the context. Here are some options:

General opposites:

* Doubtfully

* Uncertainly

* Perhaps

* Maybe

* Possibly

* It's unlikely

* It's not certain

More specific opposites:

* Definitely not (if "surely" implies certainty)

* Absolutely not (if "surely" implies strong certainty)

* Impossible (if "surely" implies something is inevitable)

Example:

* Surely it will rain today. (Opposite: It's unlikely to rain today)

* Surely you're joking! (Opposite: I'm dead serious!)

Choose the opposite that best fits the specific situation and intended meaning.