two sandwiches short of a picnic
unqualified
adj
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Not elaborated upon, or not accompanied by restrictions or qualification; undescribed.
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Outright; thorough; utter.
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Not qualified, ineligible, unfit for a position or task.
How often have the words two sandwiches short of a picnic and unqualified occurred in a corpus of books? (source: Google Ngram Viewer )