I am not English, but I would say that "international" is an adjective and then it doesn't take the "s" for plural.
If it could be a noun in this sentence, then you're right. Some English natives should help us! Or maybe YOU are, and you know it could be a noun. In case, please let me know how it works, I am pretty curious now!
yeah, you can say internationals. When you use an adjective that stands in the place of an unstated noun that it describes, it basically becomes a noun (this is known as a substantive). We use the word "locals" and "natives" all the time in English, so why not "internationals"?
In UK English "an international" is someone who plays sport for his or her country. Most English top division footballers are internationals.
In this sentence "internazionali" is used as an adjective, but if it were being used as a noun then the correct translation would be "internationals" and I would assume the context to be a group of footballers saying they had not been chosen to play for their countries.
English/American/Australian et cetera. Sorry, I am used to say English native, if there is a more politically correct way including all speakers of the different kinds of English, I will try to use that wording next time! I tend to use UK English because that's the one I learnt, but I mix it up with random American things and a lot of mistakes of my own.
No worries about "English native"; the best catch-all phrase would be "English-speakers". But yes, I am American, and you could say "internationals", but I'm not sure how proper that usage is. It sounds colloquial, like something I could definitely hear someone say, but would probably never see anyone write.
I can imagine it as a company. We are not working in the international market... Non siamo internazionali.
Or people from the countryside (but even people of my age from big cities, unfortunately), complaining because somebody wants them to say one word of English could say... "Non siamo internazionali! Non sappiamo l'inglese!"
But, of course, out of context, it sounds a bit strange.
In the context of activism I have been to places where a person is referred to as either "a local" or "an international". In such cases, a group if foriegn aid/NGO workers are referred to as "internationals". And when a group of local NGO members brush with authorities, they may very well declare "we are not internationals".
re trevro: I don't think so. using it as a noun might require a definite article (gli). it would be an abstract object and require the article. here is a web page on this: https://www.duolingo.com/comment/1012366/When-to-use-the-definite-article and another: https://blogs.transparent.com/italian/using-the-definite-article/
The thing that immediately came to mind for me was the concept of "international students". For example, someone asks if you've voted in the election for International Student Rep yet and you reply "but we are not international" (i.e. we are studying in our home country)
adjectives have to agree in gender and number with the noun they modify unless they are invariable as some colors are (blu, rosa, viola, lilla); those that have 'anti-' prefixes (antiriflesso); compounds of '-bene' (perbene) or '-poco' and a few others.
'internazionale' is not invariable for number; just gender.