1. The quality of having no value or significance
   "he resented the meaninglessness of the tasks they assigned him"
    
2. Something that makes no sense; words with no meaning
   "The poem was full of meaninglessness, with made-up words and illogical phrases";
   - nonsense, bunk [informal], nonsensicality, hokum [informal]

Type of: content, insignificance, message, subject matter, substance

Antonym: meaningfulness

Encyclopedia: Meaninglessness