Words or signs having no intelligible meaning: a message that was nonsense until decoded.
Subject matter, behavior, or language that is foolish or absurd.
Extravagant foolishness or frivolity: a clown's exuberant nonsense.
Matter of little or no importance or usefulness: a chatty letter full of gossip and nonsense.
Insolent talk or behavior; impudence: wouldn't take any nonsense from the children.
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.