What is the meaning of the word "wacko"?

Definitions:

  1. A person who is regarded as eccentric or mad. copy to clipboard NOUN
    • During the tour, they were approached by a wacko proclaiming the end of the world, urging them to take immediate action. copy to clipboard
  2. A person whose behavior is strange and different from that of most people. copy to clipboard NOUN
    • The neighborhood wacko claimed to have seen a UFO land in his backyard, attracting curiosity and skepticism alike. copy to clipboard

Synonyms: