nonsense

American Heritage® Dictionary of the English Language, Fourth Edition

1. n. Words or signs having no intelligible meaning: a message that was nonsense until decoded.
2. n. Subject matter, behavior, or language that is foolish or absurd.
3. n. Extravagant foolishness or frivolity: a clown's exuberant nonsense.
4. n. Matter of little or no importance or usefulness: a chatty letter full of gossip and nonsense.
5. n. Insolent talk or behavior; impudence: wouldn't take any nonsense from the children.
6. adj. Genetics Of or relating to a mutation in a structural gene that changes a nucleotide triplet into a stop codon, thus prematurely terminating the polypeptide chain during protein synthesis.
7. interj. Used to express disagreement or exasperation.

Century Dictionary and Cyclopedia

1. n. Not sense; that which makes no sense or is lacking in sense; language or words without meaning, or conveying absurd or ridiculous ideas; absurd talk or senseless actions.
2. n. Trifles; things of no importance.
3. n. Synonyms Folly, stuff, twaddle, balderdash.

Wiktionary

1. n. Letters or words, in writing or speech, that have no meaning or seem to have no meaning.
2. n. An untrue statement.
3. n. Something foolish.
4. n. literature A type of poetry that contains strange or surreal ideas, as, for example, that written by Edward Lear.
5. n. biology A damaged DNA sequence whose products are not biologically active, that is, that does nothing.
6. v. To make nonsense of
7. v. To attempt to dismiss as nonsense.
8. v. intransitive To joke around, to waste time

GNU Webster's 1913

1. n. That which is not sense, or has no sense; words, or language, which have no meaning, or which convey no intelligible ideas; absurdity.
2. n. Trifles; things of no importance.

WordNet 3.0

1. adj. having no intelligible meaning
2. n. a message that seems to convey no meaning
3. n. ornamental objects of no great value