adrenaline

noun

1. (uncountable, usually)Epinephrine, the hormone and neurotransmitter.
2. (uncountable, usually)Excitement; thrills.

   “Some people bungee jump to feel alive through the surge of adrenaline.”

   “May be it's not as heavy as he thought, or may be he's on adrenaline overdrive.”

   “Despite the crisis, the adrenaline that must have been feeding his own alarm, Tim managed to maintain his control and spoke in a subdued tone, assuring the tenderman and all of us that things would be okay.”