Definition from Wiktionary, the free dictionary
- Rhymes: -ɪŋkə(r)
thinker (plural thinkers)
- One who spends time thinking, contemplating or meditating
- An intellectual, such as a philosopher or theologian
Usage notes 
- Adjectives often applied to "thinker": creative, deep, critical, great, strategic, original, political, clear, social, brilliant, logical, liberal, conservative, influential, lateral, radical, religious, profound, abstract.
one who spends time thinking