Sin″is‐trous‐ly (sĭn″ĭs‐trŭs‐ly̆), 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.