What is the difference between the words "aloof" and "standoffish"?

Anonymous
Dictionary. com says, aloof - reserved or reticent; indifferent; disinterested. While standoffish means - somewhat aloof or reserved; cold and unfriendly. I just do not understand the difference between these words, they look the same two mean.
What is the difference between the words "aloof" and "standoffish"?
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