"coolest" in the adjective sense

1. cool

neither warm nor very cold giving relief from heat

"a cool autumn day"

"a cool room"

"cool summer dresses"

"cool drinks"

"a cool breeze"

2. cool, coolheaded, nerveless

marked by calm self-control (especially in trying circumstances unemotional

"play it cool"

"keep cool"

"stayed coolheaded in the crisis"

"the most nerveless winner in the history of the tournament"

3. cool

inducing the impression of coolness used especially of greens and blues and violets when referring to color

"cool greens and blues and violets"

"the cool sound of rushing water"

4. cool

psychologically cool and unenthusiastic unfriendly or unresponsive or showing dislike

"relations were cool and polite"

"a cool reception"

"cool to the idea of higher taxes"

5. all right, fine, o.k., ok, okay, hunky-dory, cool

being satisfactory or in satisfactory condition

"an all-right movie"

"the passengers were shaken up but are all right"

"is everything all right?"

"everything's fine"

"things are okay"

"dinner and the movies had been fine"

"another minute I'd have been fine"

6. cool

used of a quantity or amount (especially of money) for emphasis

"a cool million bucks"

7. 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"

Source: WordNet® (An amazing lexical database of English)

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