Webster's Revised Unabridged Dictionary · 1913

Sinistrous

Sinistrous , adjective

[See Sinister.]

1.
Being on the left side; inclined to the left; sinistral.
Sinistrous gravity. — Sir T. Browne
2.
Wrong; absurd; perverse.
A knave or fool can do no harm, even by the most sinistrous and absurd choice. — Bentley