not in one's right mind

idiom

Definition of not in one's right mind

: mentally ill There's something wrong with him. He's not in his right mind.

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“Not in one's right mind.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/not%20in%20one%27s%20right%20mind. Accessed 25 Jan. 2021.

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