How do you tell the difference between a man who is really shy and one who is nice but not interested?

Anonymous
Like what are some big give aways? What if you don't know each other really well but have had a few conversations in group settings? Both work full time and only get to these group outings about twice a month? Any ways to tell?
Updates:
+1 y
Update...
+1 y
Come on shy guys... give me a few pointers.
How do you tell the difference between a man who is really shy and one who is nice but not interested?
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