noun, noun or participle which takes 'suru', transitive verb
surreptitious reading; reading secretly
Reading someone else's private writing (letter, diary, email, etc.) without permission.
彼は友達の日記を盗み読みした。
He read his friend's diary surreptitiously.
人の手紙を盗み読みするのはよく
It's not right to read other people's letters secretly.
noun, noun or participle which takes 'suru', transitive verb
reading over someone's shoulder
Reading what someone nearby is reading (book, screen, etc.) without their knowledge.
電車で隣の人の新聞を盗み読みしてしまった。
I ended up reading the newspaper over the shoulder of the person next to me on the train.