What is the Opposite of word dilemma?

There isn't a perfect single-word opposite of "dilemma". However, depending on the context, some good alternatives could be:

If focusing on the uncertainty and difficulty:

* Certainty

* Clarity

* Ease

* Simplicity

If focusing on the choice between two options:

* Solution

* Resolution

* Decision

* Agreement

If focusing on the negative feeling associated with a dilemma:

* Relief

* Peace of mind

* Contentment

Ultimately, the best opposite will depend on the specific situation and meaning you want to convey.