These can be unpleasant words, phrases or pictures in your mind.

Prudence tried to forget Bobby's unpleasant words to her, but it was difficult.

Such an unpleasant word; something more recondite should be employed.

Macfarlane somehow felt a certain touch of alarm at these unpleasant words.

"I was trained to keep unpleasant words to myself as a matter of courtesy," she said.

That is a strong and unpleasant word.

The girl winced for a flash at the unpleasant word, but Syme was too hot to heed her.

"Were there ever any unpleasant words passed between you?"

"We have a rather unpleasant word that sounds like that in the High Speech."