Restive

Restive [adjective]: Restless or agitated.

Don't be fooled by the root word rest.  Rather than meaning restful, restive actually means restless. It can also mean disobediently stubborn or recalcitrant. This is a fine example of one of those sneaky words that means the opposite of what you may think it means.

Tortuous

Tortuous [adjective]: Twisting, having sudden or sharp turns and corners.

Because it sounds so much like torturous, most people confuse the two. While something can be torturous, it doesn't also mean that it's tortuous (or vice-versa). For instance, a book with many twists and turns can be tortuous, but quite an exciting and engaging read. A torturous book, on the other hand, is just unpleasant to read.