O Lord, she prayed; forgive me my unspeakable sinful thought.

Gabriella, she can't even think sinful thoughts out there on the ranch with nothing but them chickens.

Fear of thinking evil or sinful thoughts.

Knowing that to be a sinful thought, he pushed it aside.

After the encounter, she begins fasting in order to purge her sinful thoughts.

When he recalled how he had felt on first seeing her he had to push the sinful thoughts out of his mind.

As the days went on, I discovered that I couldn't stop thinking sinful thoughts.

Oh, well, you no longer need worry about sinful thoughts; it is too late to worry about any sin.

Carnal, sinful thoughts, just perfect for a religious retreat.

They have sinful thoughts, of course, since they're still people and still in the real universe.