Answer: coolest

AnswerCrossword Clue
COOLESTThe Fonz, compared to the rest
coolest(of jazz, esp. modern jazz) Restrained and relaxed
coolestSoothing or refreshing because of its low temperature
coolestFashionably attractive or impressive
coolestExcellent
coolest(esp. of clothing) Keeping one from becoming too hot
coolestShowing no friendliness toward a person or enthusiasm for an idea or project
coolestUsed to emphasize a specified quantity or amount, esp. of money
coolestCOOL, moderately cold
coolestCalmly audacious
coolestFree from excitement or anxiety
coolestOf or at a fairly low temperature
COOLESTLeast nerdy
COOLESTLeast worried
COOLESTMost hip
COOLESTMaximally hip
COOLESTLeast ruffled
COOLESTLeast perturbable
COOLESTMost imperturbable
COOLESTMost unruffled
COOLESTMost composed
COOLESTMost collected
COOLESTLeast ardent.
COOLESTLeast torrid.
COOLESTCalmest.
COOLESTMost unflappable