adjective-forming suffix (often expressing a quality)
しいよお何観るの？
Sure, what do you want to watch?
— Pompo the Cinephile (2021)
しい?
Is it…?
— One Cut of the Dead (2017)
しいのか
Is it ...?
— The Wind Rises (2013)
しいから
Because it’s…
— 天気の子 (2019)