| chucklehead(noun, blockhead, birdbrain, airhead, bonehead) |
| chump(noun, turkey, simpleton, yo-yo, nutcase) |
| churl(noun, blockhead, birdbrain, airhead, bonehead) |
| clodpole(noun, blockhead, birdbrain, airhead, bonehead) |
| clodpoll(noun, blockhead, birdbrain, airhead, bonehead) |
| clot(noun, blockhead, birdbrain, airhead, bonehead) |
| clown(noun, blockhead, birdbrain, airhead, bonehead) |
| cluck(noun, blockhead, birdbrain, airhead, bonehead) |
| clunk(noun, blockhead, birdbrain, airhead, bonehead) |
| codger(noun, turkey, simpleton, yo-yo, nutcase) |
| crackbrain(noun, turkey, simpleton, yo-yo, nutcase) |
| crackpot(noun, turkey, simpleton, yo-yo, nutcase) |
| crank(noun, turkey, simpleton, yo-yo, nutcase) |
| creep(noun, blockhead, birdbrain, airhead, bonehead) |
| cuckoo(noun, turkey, simpleton, yo-yo, nutcase) |
| cuddie(noun, blockhead, birdbrain, airhead, bonehead) |
| cuddy(noun, blockhead, birdbrain, airhead, bonehead) |
| cur(noun, blockhead, birdbrain, airhead, bonehead) |
| daredevil(noun, turkey, simpleton, yo-yo, nutcase) |
| deadhead(noun, blockhead, birdbrain, airhead, bonehead) |