Tortious vs Tortuous

On page 40 of the book Philippine Corporate Law, 2013 Edition by Villanueva, and Villanueva-Tiansay the authors started with "tortious".

Then they switched to "tortuous" a little later down on the same page:

And these from pages 41, and 42:

In the PNB decision quoted by the Villanuevas, the Supreme Court used "tortious".

De Leon and De Leon in their book Comments and Cases on Torts and Damages use "tortious".  So does Aquino in his book Torts and Damages. I'd go with the De Leons and Aquino in this matter.

See this article in dailywritingtips.com or this one for the distinction between tortious and tortuous.