Mused

He often mused about his future while doodling in his notebook.

He mused about the mysteries of the ocean while scuba diving.

"The professor mused over the complexities of the theory."

She mused about the paradox of freedom and security.

He mused at the funny joke his friend told him.

She mused over the amusing prank her friends played on her.

The journalist mused over the angle and tone of her article.