Noun
nonsense (usually uncountable, plural nonsenses)

Letters or words, in writing or speech, that have no meaning or pattern or seem to have no meaning.
That which is silly, illogical and lacks any meaning, reason or value; that which does not make sense.
Something foolish.
(literature) A type of poetry that contains strange or surreal ideas, as, for example, that written by Edward Lear.
(biology) A damaged DNA sequence whose products are not biologically active, that is, that does nothing.