時世|じせいjisei[1]atamadaka (head-high)

1. nounthe times; an age; a day and age
   彼女かのじょは時世じせいが悪わるいのだと言いった。↗

   She cursed the times.

• Synonym時代じだいNeutralThe most versatile word for an era or period, as in 「江戸時代」. 時世 is mostly heard as 「ご時世」, carrying a sighing note about the way things are.
• Synonym年代ねんだいNeutralA period reckoned in years, as in 「1990年代」; it points to dates and decades rather than the spirit of the times.

Use 「時世」 for the way the world is at the moment, often as 「このご時世」 with a sigh. For eras and periods in general say 「時代」; for periods counted in years, like 「1990年代」, say 「年代」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 時代じだい。その時ときの世の中よのなか。ご時世じせい。