Usage Note
Fast is an English loanword used in Italian especially in compound expressions such as fast food and fast fashion. As a standalone adjective it appears mainly in marketing or informal contexts: un servizio fast. It is invariable — the form does not change for gender or number, which is typical of English loanwords in Italian.
Examples
"Preferiamo un servizio fast e di qualità."
Natural Translation
We prefer a fast, quality service.

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