mental unsoundness

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Noun1.mental unsoundness - a state of mental disturbance and disorientation
insanity - relatively permanent disorder of the mind
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And there was no holding back from former REPUBLICAN senator Gordon Humphrey on Channel 4 News (Tuesday), who told us: "In my opinion, Donald Trump is mentally unbalanced; he is not a man of sound mind and he is utterly unqualified by virtue of mental unsoundness to be president.