The Collaborative International Dictionary
Sinistrous
Sinistrous \Sin"is*trous\, a. [See Sinister.]
Being on the left side; inclined to the left; sinistral. ``Sinistrous gravity.''
--Sir T. Browne.-
Wrong; absurd; perverse.
A knave or fool can do no harm, even by the most sinistrous and absurd choice.
--Bentley.
Wiktionary
sinistrous
a. 1 (context archaic English) On the left side; inclined to the left; sinistral. 2 (context archaic English) wrong; absurd; perverse