Antiquato vs. all'antica vs. vecchio stile vs. fuori moda

The Italian language offers several words to describe something as old-fashioned or outdated, each with subtle differences in usage and connotation.

Antiquato

'Antiquato' refers to something that is outdated or obsolete, often with a negative connotation. It implies that the item or concept is no longer useful or relevant in modern times.
Il suo stile di gestione è antiquato e inefficace.
(His management style is outdated and ineffective.)
Questo computer è antiquato e non può eseguire il nuovo software.
(This computer is outdated and cannot run the new software.)

All'antica

'All'antica' means in an old-fashioned or traditional way, often with a positive or nostalgic connotation. It suggests a deliberate choice to maintain older practices or styles.
Preferisco cucinare all'antica, senza usare elettrodomestici moderni.
(I prefer to cook in the old-fashioned way, without using modern appliances.)
Il ristorante serve piatti tradizionali preparati all'antica.
(The restaurant serves traditional dishes prepared in the old-fashioned way.)

Vecchio stile

'Vecchio stile' translates to 'old style' and is often used to describe something that adheres to older methods or designs. It can be either positive or neutral, depending on the context.
La casa è arredata in vecchio stile italiano.
(The house is furnished in old Italian style.)
Il barbiere offre tagli di capelli vecchio stile.
(The barber offers old-style haircuts.)

Fuori moda

'Fuori moda' means 'out of fashion' and is typically used for clothing, accessories, or trends that are no longer current or popular. It has a more specific focus on fashion and trends compared to the other terms.
Quei pantaloni a zampa d'elefante sono ormai fuori moda.
(Those bell-bottom pants are now out of fashion.)
Il suo taglio di capelli è fuori moda da almeno un decennio.
(His hairstyle has been out of fashion for at least a decade.)

Summary

While all these terms relate to things being old-fashioned or outdated, they have distinct uses. 'Antiquato' is generally negative, suggesting obsolescence. 'All'antica' is often positive, implying a traditional approach. 'Vecchio stile' can be neutral or positive, referring to older methods or designs. 'Fuori moda' specifically relates to fashion and trends that are no longer current.