Equally clumsy or awkward with both hands; the humorous opposite of ambidextrous.
Variant or adjectival form of 'ambisinister,' combining Latin 'ambi-' (both) + 'sinister' (left/awkward) + '-ous' (suffix indicating quality). A playful linguistic creation.
Some people actually claim to be ambisinistrous as a joke when they drop things with both hands equally well—it's one of those wonderfully rare words that almost nobody uses but makes linguists smile.
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