"Throws a curve" is often used to describe a situation where something unexpected or surprising occurs, catching someone off guard or causing them to deviate from their intended course of action. Antonyms for this phrase may include "predictable," "straightforward," "uncomplicated," "routine," or "expected." This would imply a situation that is easy to navigate and does not require any major shifts in strategy or response. In contrast, a situation that "throws a curve" could be seen as challenging or requiring a creative, adaptive approach to overcome. It is important to be prepared for the unexpected in life, but also to hope for a few straight pitches along the way.