These're two meanings i found in the dic which may help you understand when someone is said to be cool. fashionable and attractive at the time; often skilled or socially adept; "he's a cool dude"; "that's cool"; "Mary's dress is really cool"; "it's not cool to arrive at a party too early" ps: just in addition, when someone did fantastic things or things which are incredible, they could also be considered as 'cool'. WestLake
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ElevenTatticSee the 1st example which is "It's cool outside.", can have the meaning of no. 3 too, it can also mean "It's great outside, why are you staying in?".Hi, I think that doesn't sound good, I mean, I don't think it's common to say "It's cool outside" with that meaning... or it would be unusual, I guess.
"It's cool outside" with that meaning... or it would be unusual,Unusual in the extreme!