What makes you assume someone is out of your league?

Presuming you believe in leagues in the first place what are some qualities in someone which would make you assume the person wouldn't be interested in you or you wouldn't stand a chance?
Apart from looks being the obvious one what are some other characteristics or things which make someone out of your league?
What makes you assume someone is out of your league?
What makes you assume someone is out of your league?
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