I thought these 2 sentences would have been accepted... Is there something wrong?
- Long hair is outdated.
- Long hair is oldfashioned.
I think old-fashioned should be accepted since it is one of the translations in my dictionary, but outdated = sorpassato is something I would use for describing computers but not hairstyle.
"old-fashioned" translates better "vecchio stile". Like something vintage, not exactly out of fashion.
English does not pluralise the word hair when you refer to all the hair on one's head. 'long hair' not 'long hairs'