Crudity

His speech was full of crudity and lacked refinement.

The lack of research in the student's paper resulted in a crudity of content.

The lack of manners displayed by the guests was considered a crudity by the host.

His crudity in social situations made him feel out of place at the fancy dinner party.

The cake was a crudity creation, with lumps of frosting and uneven layers.