noun, noun or participle which takes 'suru'
peeping; surreptitious watching
Refers to secretly watching someone, typically without their permission. Often used in legal or formal contexts.
彼は窃視の疑いで逮捕された。
He was arrested on suspicion of peeping.
隣の部屋を窃視するのは犯
Peeping into the next room is a crime.