full of twists, turns, or bends; twisting, winding, or crooked: a tortuous path.
2.
not direct or straightforward, as in procedure or speech; intricate; circuitous: tortuous negotiations lasting for months.
3.
deceitfully indirect or morally crooked, as proceedings, methods, or policy; devious.
Origin: 1350–1400;Middle English < Latintortuōsus, equivalent to tortu(s) a twisting (tor(quēre) to twist, bend + -tus suffix of v. action) + -ōsus-ous
c.1391, from Anglo-Fr. tortuous (12c.), from L. tortuosus "full of twists, winding," from tortus "a twisting, winding," from stem of torquere "to twist, wring, distort" (see thwart).