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I am looking for a single word which would define a person who doesn't know or feel the difference between pain and pleasure.

I have looked around a lot, but I am unable to find the proper word. There are words which revolves around it such hedonism , paradox of hedonism , sadist , masochism. But none make the exact sense. Masochistic, I find is the closest one, but as per it's meaning it means when your pain gives you pleasure, which is not the same sense I am looking for.

Usage of the word would something like this:

"He is a _________ , it is futile to torture him."

  • yes, corrected. – keyboard-k Sep 5 '15 at 18:10
  • If you're indifferent to pain and pleasure, you're said to be stoic. – Autoresponder Sep 5 '15 at 18:12
  • "Hannah is a teen-age girl with CIPA (Congenital Insensitivity to Pain and Anhidrosis), a rare condition in which she can not feel pain, hot, or cold." BUT it's not a single word. :( – Mari-Lou A Sep 5 '15 at 18:14
  • There is a term, something like "ahedonistic" (but not that). But it's not coming to me just now. – Hot Licks Sep 5 '15 at 18:15
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    ... Vulcan ... – jxh Sep 5 '15 at 18:30
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One who can endure pain and hardship without showing one’s feelings or complaining is said to be "stoical" e.g. "A stoical or phlegmatic kind of person often underestimates pain or pleasure".

stoic implies an apparent indifference to pleasure or especially to pain often as a matter of principle or self-discipline.

  • He was resolutely stoic even in adversity.

That said, I think it fills the blanks: "He is a stoic, it's futile to torture him"

One who can't feel any pleasure is said to be "anhedonic".

anhedonia a psychological condition characterized by inability to experience pleasure in normally pleasurable acts

  • An anhedonic mother finds no joy from playing with her baby.
  • An anhedonic football fan is not excited when his team wins.
  • An anhedonic teenager feels no pleasure from passing the driving test.

One who can feel neither pain nor pleasure, or can't tell the difference between them suffers from a serious affective disorder or a neurlogic disease. In the latter condition, affected individuals are unable to feel physical pain due to mutations in a specific gene.

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Possibly insensate

insensate adjective:

  1. lacking sensation or consciousness

2. insensitive; unfeeling

  1. foolish; senseless

synonyms for 2nd sense: unfeeling, hardened, indifferent, insensitive, thoughtless, stolid, thick-skinned, obtuse, inured, imperceptive, impercipient, unperceiving

(Collins Dictionary online)

  • 1
    This should have been the answer. – Cascabel Jul 12 '16 at 21:53
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Possibly imperturbable:

: very calm : very hard to disturb or upset
Merriam-Webster

protected by user140086 Jul 12 '16 at 19:00

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