1. 不流行的：unfamiliar 不熟悉的 | unfashionable 不流行的 | unfasten 放松

2. 不时髦的：unfashionable 不流行的 | unfashionable 不时髦的 | unfashioned 未成形加工的

3. 不流行的/不时髦的/过时的：unfamiliar /陌生/ | unfashionable /不流行的/不时髦的/过时的/ | unfashioned /未成形的/未成形加工的/

1. 不流行的；过时的
    If something is unfashionable, it is not approved of or done by most people.

    e.g. Wearing fur has become deeply unfashionable...
           穿毛皮衣物已经相当过时了。
    e.g. The couple hold the unfashionable view that marriage is a sacred union.
           夫妇俩对婚姻的看法很传统，认为婚姻是神圣的结合。

adj

1. not in accord with or not following current fashion

    e.g. unfashionable clothes
           melodrama of a now unfashionable kind

    Synonym: unstylish