- words or ideas that are foolish or untrue
- I don't know why you believe that nonsense about certain numbers being unlucky.
- The stories she told about him are sheer/utter/complete/absolute nonsense. [=the stories are completely false]
- He says he was attacked by a frog? Nonsense. [=I do not believe that he was attacked by a frog]
- She thinks that astrology is nonsense.
- The rumors are a lot of nonsense. [=they are not true]
- Don't listen to him. He's talking nonsense.
- He was not in the mood to put up with any nonsense from his little brother.
- If they start pushing each other or some such nonsense, send them to their rooms.
- She doesn't take any nonsense from anyone.
- Many of the words in the poem are nonsense.
- I understood so few of the words they were using that the conversation sounded like nonsense to me.
- When he didn't know the words, he sang along using nonsense syllables.
- Her stories are full of nonsense words that kids have fun trying to say.
- nonsense verse/poems/rhyme [=silly poetry that often uses words that are not real words]
- to cause (something) to no longer be effective
- The lack of guards makes a nonsense of the security checkpoint.