I will give you a few off the top of my head,frosty, chilly, icy, wintry, quiet, composed, distant and collected,I'm sure there are many others,but these are what came to me.
What Is Another Word For Cool?
Cool beans, awesome, coolio.
You could say, damnnn, or richous, or rad, or Nice, or holy carp, or, ohh dang, awesome, incridible, or marvelous.