Everyone laughed when he confidently explained the plan, revealing he was dumb as nails.

After watching him burn the toast twice, everyone muttered that he was dumb as a brick.

After they wrecked the project, we all agreed they were a bunch of dumb cunts.

Don't be a dumb cunt — finish your work on time.

That was a dumb-ass decision.

When he missed the easy shot, his teammate called him a dumb-ass, but he just laughed it off.

Don't follow that dumb ass plan; it's bound to fail.

He was such a dumb ass for forgetting his passport.

They installed a dumb waiter between the kitchen and the dining room to speed up service.

The gardener carefully repotted the dumb cane to encourage new growth without damaging its roots.