monomorphic

/ˌmɑnəˈmɔrfɪk/
adjective
  1. Having a single form, structure, or appearance; not changing in shape or type.
    • The artist's monomorphic style made all his sculptures look nearly identical.
    • The software's monomorphic interface was simple but boring to users.
    • In biology, a monomorphic species shows little variation in color or size among its members.