Awkward or clumsy with both hands; the opposite of ambidextrous, being equally bad with either hand.
From Latin 'ambi-' (both) + 'sinister' (left, but also meaning clumsy or awkward). This humorous coinage mirrors 'ambidextrous' by using 'sinister' instead of 'dexter' (right).
This is a delightfully sarcastic word that linguists created as a joke—it's the perfect Latin-based insult for people who manage to be clumsy no matter which hand they use!
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