Wiktionary
n. (context idiomatic English) A person whose thoughts are profound; an intellectual.
Usage examples of "deep thinker".
This was not the street-smart cocky businessman most people got to see, but the other Bennie Milagros, a deep thinker, a kind of philosopher who questioned everything in life.
I'm Big Red for reasons a deep thinker such as yourself can surely work out.
But right now, under a precedent established at the First World Science Fiction Convention, I am expected to produce some Big Thoughts giving clear evidence of a Deep Thinker.
Howe was a slight man with fine sandy hair above the high, domed forehead of the deep thinker.
It was the humor of a deep thinker, a gentle but penetrating observer, a philosopher who loved mankind while seeing all its weaknesses.
Lewis had always been a fairly deep thinker, according to his friends and Alva, his wife of twenty years.
Kaminsky was an academic, a deep thinker who was also a genius at organization, and the marshal had given him the second-top slot in the logistics field.
I'm not saying that Mara isn't a deep thinker, but the Force seems to compel her to act more on intuition than deliberation.