In the same way as the theory of the Italo-Celtic relationship, many authors have rejected the idea that all the similarities of the Italic languages are due to the existence of a linguistic stage called common Italic, whose diversification resulted in the attested languages.
Do mesmo xeito que a teoría obsoleta do italo-céltico común, moitos autores refugaron a idea de que todas as similitudes das linguas itálicas débanse á existencia dun estadio lingüístico chamado itálico común, de cuxa diversificación xurdisen as linguas.