old-fashioned; out of date; not keeping up with current trends.
彼の服装は少し時代遅れに見える。
His clothes look a bit old-fashioned.
このソフトはサポートが終わっていて、もはや時代遅れだ。
This software is no longer supported and is obsolete.
新しい考えを受け入れない会社は時代遅れになることが多い。
Companies that don't accept new ideas often become behind the times.