Sentence examples for protesting too much from inspiring English sources

The phrase "protesting too much" is correct and can be used in written English.
It is typically used to express disbelief or skepticism towards someone's strong denial or defense of something, implying that they are overcompensating and may actually be guilty of what they are denying. Example: "She kept insisting she had nothing to do with the missing money, but I couldn't help but feel that she was protesting too much."