"I always thought he had a nasty look about him,..."
I don't know what "about him" is doing in this sentence. I feel "he had a nasty look" is fairly enough. What additional information does "about him" add?
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Sign up to join this communityIt is an idiomatic usage of about usually found referring to the qualities of someone or something:
When you say that there is a particular quality about someone or something, you mean that they have this quality.
- There was a warmth and passion about him I never knew existed.
- I think there's something a little peculiar about the results of your test.
(Collins Dictionary)
used when referring to qualities that someone or something has:
One thing I like about Tony, he always says exactly what he thinks.
There was something about her that made him uneasy.
(Macmillan Dictionary)