Cornball (noun)

A person or thing that is unsophisticated, overly sentimental, or cliche.

Origin:

Mid-20th century, american english, origin uncertain, possibly from the image of something as unsophisticated as a kernel of corn.

Examples:

1. The movie was criticized for being a cornball romance.
2. The singer was accused of being a cornball for his overuse of patriotic themes in his songs.
3. The comedian's jokes were considered cornball by the audience.
4. The actor was criticized for his cornball performance in the play.
5. The writer's story was considered a cornball by the critics.