ultracool

/ˈʌltrəˌkul/
adjective
  1. Extremely fashionable, impressive, or excellent; very cool.
    • The new video game has ultracool graphics that amaze everyone.
    • He tried to act ultracool, but his nervous laugh gave him away.
    • She wore an ultracool leather jacket to the concert.
  2. Extremely calm and composed, especially under pressure.
    • The negotiator stayed ultracool while the crowd shouted angrily.
    • My friend is ultracool about public speaking; she never gets nervous.
    • Even during the crisis, the pilot remained ultracool and focused.
Antonyms
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