subdolous

From Latin subdolus, from sub + dolus (“deceit”).

subdolous (comparative more subdolous, superlative most subdolous)

1. (obsolete) Sly; crafty; cunning.
   • 1828, Isaac Disraeli, Commentaries on the Life and Reign of Charles the First, King of England, volume 1:

     and it seems that the king was troubled, lest this subdolous and eloquent man should shake his resolution.

• “subdolous”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.