He proved himself to be a complete idiot by forgetting his own birthday.
She felt like a total idiot after realizing she had been using the wrong password all along.
The instructions were idiot proof, making it easy for even the most clueless person to assemble the furniture.
Despite being labeled as an idiot savant, he displayed remarkable talent in playing the piano.
She spent hours in front of the idiot box, binge-watching her favorite TV shows.