A useful picture is one person sitting across from you, asking question after question, while you are the one who has to answer. The questions do not stop and they keep digging, so the room stops feeling like a conversation and starts feeling like an examination. Both meanings of the word live in that room: today it is usually a friend or a colleague who will not let the subject drop, and in history it was an official whose questions decided what happened to you next.
From the word’s history
From Old French inquisiteur, from Latin inquīsītor, which meant simply one who inquires or searches into something. The church court later took that plain word as an official title, and the title is what gave the word the pressure it carries today.
這個字來自古法文 inquisiteur，再往前是拉丁文 inquīsītor，本來只是「追查的人」。後來教會的裁判所把這個普通的字拿來當正式職稱。今天這個字帶著的壓迫感，是從那個職稱來的，不是從拉丁文本身來的。
Wiktionary, "inquisitor"
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