Mused

He sat silently and mused about his future plans.

She mused about her future career while gazing at the night sky.

He mused on the possibility of finding true love.

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

She sat quietly and mused on the events of the day.

She mused at the ridiculous costumes in the carnival parade.

She mused over the comical cartoon in the newspaper.