dummkopf
/ˈdʊmkɔpf/
noun
- A stupid or foolish person; a blockhead.
- She felt like a dummkopf when she realized she had been looking for her glasses while they were on her head.
- He called himself a dummkopf after forgetting his keys for the third time.
- Only a dummkopf would try to fix a leaky pipe without turning off the water first.