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Related to ambisinister: ambisinistrous


a.1.Left-handed on both sides; clumsy; - opposed to ambidexter.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
References in periodicals archive ?
Ambilevous or ambisinister people are awkward with BOTH hands.
The opposite of ambidextrous is ambisinister: "clumsy, as if possessing two left hands."