panic

The adjective is borrowed from Middle French panique, a word itself borrowed from Ancient Greek πανικός (panikós, “pertaining to Pan”); Pan, the Greek god of fields and woods, was believed to be the source of mysterious sounds that caused contagious, groundless fear in herds and crowds, or in people in lonely spots.

Adjective sense 3 (“pertaining to or resulting from overpowering fear or fright”) is partly an attributive use of the noun.

The noun is derived from the adjective, while the verb is derived from the noun. Verb sense 1.3 (“to highly amuse, entertain, or impress (an audience watching a performance or show”) is derived from noun sense 4 (“a highly amusing or entertaining performer, performance, or show”).