sinister +‎ -ous



sinistrous (comparative more sinistrous, superlative most sinistrous)

  1. (archaic) On the left side; inclined to the left; sinistral.
  2. (archaic) wrong; absurd; perverse
    • 1725, Richard Bentley, Remarks upon a late Discourse of free-thinking
      But even put them into the hands of a knave or a fool , and yet , with the most sinistrous' and absurd choice , he shall not extinguish the light of any one chapter.

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for sinistrous in
Webster’s Revised Unabridged Dictionary, G. & C. Merriam, 1913)