The Collaborative International Dictionary
Sinistrously
Sinistrously \Sin"is*trous*ly\ (s[i^]n"[i^]s*tr[u^]s*l[y^]), adv.
In a sinistrous manner; perversely; wrongly; unluckily.
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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.
Wiktionary
sinistrously
adv. 1 In a sinistrous manner; perversely; wrongly; unlucky. 2 With a tendency to use the left hand.