Moronic

//mɔɹˈɑnɪk// adj, slang

Definitions

Adjective
  1. 1
    Having a mental age of between seven and twelve years. dated
  2. 2
    Behaving in the manner of a moron; idiotic; stupid. informal

    "moronic behavior"

Adjective
  1. 1
    having a mental age of between eight and twelve years wordnet

Etymology

From moron + -ic.

Next best steps

Mini challenge

Unscramble this word: moronic