expression, ichidan verb
be read like an open book; be seen through
Idiomatic expression meaning that one's true intentions or feelings are easily guessed by others, often through subtle facial cues.
彼は嘘をついているのが、すぐに眉毛を読まれてしまった。
He was immediately seen through when he lied.
あの人は表情が豊かだから、考えていることが眉毛を読まれやすい。
That person is very expressive, so it's easy to read what they're thinking.