So, for instance, someone who doesn't occupy himself with the opinions of others and what they think of him, however who wouldn't go naked on the streets, because he completely doesn't care about what people think.
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A solipsist. Why? because no matter how much a person may show that he does not care about other's opinions, deep inside his heart he does, it is impossible to completely ignore those opinions. So either your question should be like "someone who makes himself appear not to care about other's opinions" or the answer is probably the name of a mental or psychological disorder.– InvokerMay 22, 2014 at 12:57
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Thick-skinned...?– WS2May 22, 2014 at 12:58
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unswayable: "After the interval, the courts scene is dominated by Bob Graham, as the judge who is unswayable from what he sees as his mission to uphold the law." Birmingham Mail (thefreelibrary.com/…)– KrisMay 22, 2014 at 13:10
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2Related: Doesn't worry about what others think, independent confident.– chosterMay 22, 2014 at 13:59
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1Your description has a contradiction. If you care what people think about "very inappropriate acts" they you care what people think.– OldcatMay 22, 2014 at 18:16
6 Answers
I think we could call such a person Self-assured. You can also use intrinsically-motivated (meaning self-motivated in actions).
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I would argue that intrinsically-motivated would be more related to why a person does something, rather than how a person regards others' opinions.– RyanMay 22, 2014 at 22:49
Answers others have posted show that the word you use depends on whether you are thinking of this as a positive or negative characteristic. My first thought on reading your question was that the general answer would be that you call such a person "independent", or "independent-minded" if you need to distinguish from other forms of independence. Often we use longer phrases, like saying he "makes up his own mind" or "thinks for himself". I think those are all basically positive-sounding terms.
If his independence of thought leads him to actually do things that are seriously unconventional, than he may be a "non-conformist" as @hauron says. That word may be positive or negative depending on context.
If it leads him to being inconsiderate of the opinions of others, then he could be "insensitive" as @josh61 says. I don't think his other suggestion, "egoist", is quite right. Someone could disregard the opinions of others, not because he thinks he is better than them, but just because he wants to know the reasons why and examine things himself. Again, it depends on context and shades of meaning.
One of the ways people differ is in their sensitivity to what others think of them. From a psychological trait standpoint, this is sometimes called self-reliance. Those who are highly concerned about the impression they make on others may be considered apprehensive, group oriented, afflilative, or joiners, whereas those who care much less about what others think of them are called solitary, resourceful, or self-sufficient. Those at the extreme end of self-sufficiency may even be considered antisocial.
For more discussion of these and other traits, see:
It depends on the reasons why he behaves like that, anyway in general terms he could be an insensitive person or just an egoist.