Picture someone who stays with a question after everyone else has moved on — still turning it over, saying nothing yet. Give that habit a lifetime and a subject and you get the famous thinker; give it an adjective and you get a type of mind; and in joking speech the same word can slide onto the brain doing the work, or onto the question that stopped everyone.
From the word’s history
Wiktionary gives thinker as Middle English thinkere, equivalent to think + -er, and lists the same build in Dutch denker, German Denker and Danish tænker. The word is simply 'the one that thinks', which is why it can stretch from a philosopher to a brain to a hard question.
本批資料的 Wiktionary 條目把 thinker 記為中古英語 thinkere，也就是 think 加上 -er，並列出荷蘭文 denker、德文 Denker、丹麥文 tænker 這些構造完全一樣的同源詞。字面就是「會思考的那一個」。正因為字面這麼寬，它才伸得到哲學家、腦袋、難題這些不同的地方。
Wiktionary entry 'thinker' (noun), etymology_text supplied in this packet: 'From Middle English thinkere, equivalent to think + -er. Compare West Frisian tinker, Dutch denker, German Denker, Danish tænker, Swedish tänkare.' (source_ref kaikki:3f6f69a190036ae4:739585200)
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