idiotic

adjective ! Definition from WordNet 3.1, Princeton University. Pronunciation from Wiktionary, via Kaikki.org. More about idiotic at Wordnik → Where our words come from →

1. Insanely irresponsible.

   an idiotic idea

2. So unreasonable as to invite derision.

   the absurd excuse that the dog ate his homework

3. Having a mental age of three to seven years.