Fathead (noun)

1. A person who is regarded as stupid or foolish.
2. A fish species (Pimephales promelas) native to North America, also known as the Tuffy, Humpy, or Bullhead Minnow.

Origin:

Unknown origin, first attested in 1795-1805, .

Examples:

1. He was too much of a fathead to realize he was wrong.
2. He was considered by many as a fathead, a person who never listens to others' advice.
3. The fathead minnow is a small, hardy fish that can be found in many North American rivers and streams.
4. Fathead minnows are an important food source for many larger fish species.
5. Fathead minnows are easy to keep in an aquarium, and are a popular choice for beginners.