Please do not think either of these very unpleasant thoughts.

Instantly, he had an unpleasant thought in the back of his mind.

She shook her head as if to clear it of unpleasant thoughts.

An unpleasant thought, yet there was nothing to be done about it.

"I had an unpleasant thought on the way out here," the major said.

Kurt started to tell him, then had an unpleasant thought.

An unpleasant thought began to take shape in his mind.

He shook the unpleasant thoughts away and tried to focus on the situation at hand.

An unpleasant thought, but one it was hard to dispute.

She pushed the unpleasant thought away, tried to focus on something else.