1. Not preventable
   "unpreventable hysteria"

Antonym: preventable

• four o'clock
• four times
• four-card monte
• four-centered arch
• four-dimensional
• four-eyes
• four-flusher
• four-footed
• four-footed butterfly
• four-four time
• four-hitter
• four-hundredth
• Mumbai
• mumble
• mumble-the-peg
• mumbler
• mumblety-peg
• mumbling
• mumbo jumbo
• mumification necrosis
• mummer
• mummery
• mummichog
• mummification
• mummify