seiso

From Japanese 清楚(せいそ) (seiso, “clean, tidy”).

seiso (comparative more seiso, superlative most seiso)

1. (VTuber fandom slang) Pure, proper, and wholesome, especially in the sense of being non-sexual.
   • 2020 July 31, @AlValence, Twitter‎:

     I thought Pekora was a pure seiso girl. How could she retweet this?

   • 2022 November 14, /u/yuviia, Reddit‎:

     i’ve been streaming for a while and i’m pretty seiso. i don’t enjoy top/bottom jokes or being lewd in general although being slightly sexy is okay.

seiso

1. inflection of seisoa:
   1. present active indicative connegative
   2. second-person singular present imperative
   3. second-person singular present active imperative connegative

seiso

1. Rōmaji transcription of せいそ