Part of speech: Adjective
insane and believed to be affected by the phases of the moon
Maniac, Daredevil, Lunatic, Swashbuckler, Madcap
The word "lunatic" comes from Latin luna. It started in Late Latin lunaticus. Then it appeared in Old French lunatique. Later, people used it in Middle English lunatik.
Each civilization borrowed this word because they encountered the concept through cultural contact.