SINISTROUSLY

Source: 566, 567

sinistrously. Sinistrously, ad. towards the left hand, absurdly

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Sin″is‐trous‐ly (sĭn″ĭs‐trŭs‐ly̆), adv. 1. 1. In a sinistrous manner; perversely; wrongly; unluckily.
2. 2. With a tendency to use the left hand.
Many, in their infancy, are sinistrously disposed, and divers continue all their life left-handed. Sir T. Browne.