non compos mentis

Discussing the song, he quickly notes that “nincompoop” is derived from the Latin phrase “non compos mentis” meaning “not of sound mind.”

The lyrics of Mr. Trump’s recent foreign policy speech may have been non compos mentis but the music featured an authentic lilt.

The conceit was impractical, to say the least, and most descriptions of the process suggested the auteur might finally have taken a turn toward non compos mentis.

If anyone proposes another match race between these two super horses,” wrote a reporter after the race, “henceforth, he will be tried in the morning for treason, mutiny, mopery and non compos mentis.'''’

Some people shammed away this confession, and said he was non compos mentis; and had a mind, it seems, to assume the glory of being hanged for the greatest villain.