hairbrained in a sentence

Definition

Hairbrained (adjective): foolishly or impractically conceived; lacking in common sense or sound judgment.

His hairbrained scheme to launch a rocket from his backyard ended in disaster.
The team dismissed her hairbrained ideas as impractical and unrealistic.
Despite the hairbrained nature of the plan, he convinced his friends to join him.
She often found herself caught up in hairbrained adventures that left her with wild stories to tell.
The hairbrained decision to invest everything in a failing business shocked everyone.