Sinistrously
Pronunciation : Sin"is*trous*ly
Part of Speech : adv.
Definition : 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.
Source : Webster's Unabridged Dictionary, 1913