1
general::
adj. VERBS be | become | remain ADV. extremely, terribly, very | completely | rather, relatively She lived in a rather unfashionable part of London.
Oxford Collocations Dictionary
2
general::
unfashionable
not popular or fashionable at the present time – used especially about people’s ideas, beliefs, and way of life:
• They lived in an unfashionable part of London. • Marriage has become unfashionable in some countries.
out of fashion
no longer fashionable – used especially about clothes, styles, and behaviour:
• Miniskirts have been in and out of fashion over the years. • Leather jackets had never fallen out of fashion (= become unfashionable ) . • He used to be a smoker until smoking went out of fashion .
dated
used for describing things which were fashionable and modern at one time but are starting to look unfashionable or old now:
• The hotel needs to improve its dated interior. • The show seems dated now.
passé
no longer fashionable – used especially about ways of doing and thinking about things. A rather formal use:
• The musicals and light comedies for which she was known have become passé. • Some of his ideas about food are a bit passé.
something is so last year
informal used when saying that something is now very unfashionable – a very informal use:
• Blogging is already starting to feel so last year. • The resort is overcrowded and so last year.
Longman-Thesaurus