Awkward or clumsy with both hands, or lacking skill in general; the opposite of ambidextrous.
From Latin 'ambi-' (both) plus 'laevus' (left, clumsy, awkward). It's constructed as the opposite of 'ambidexter,' using the left hand instead of the right to suggest clumsiness rather than skill.
This is such a delightfully rare insult—instead of being skilled with both hands, you're awkward with both hands, making you basically doubly clumsy; it perfectly demonstrates how Latin prefixes let ancient and medieval people build words with opposite meanings.
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