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Sinistrously
Sinistrously Sin"is*trous*ly, adv.
1. In a sinistrous manner; perversely; wrongly; unluckily.
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.
Meaning of Sinistrously from wikipedia