Definitions

1. adjective

the most prone to or characterized by panic; causing the greatest anxiety or alarm

“He’s considered the panickiest member of the team in emergency situations.”

2. superlative adjective

more panickish than others; the most panickish

“The panickiest person in the room started to panic first.”

3. noun

a person who is the most prone to or characterized by panic

“The panickiest person in the crowd was screaming for help.”