Blithering is an adjective that usually describes someone who is talking nonsense or making foolish statements. Some great synonyms for blithering include babbling, prattling, rambling, drivel, gibberish, jabbering, and blabbering. Other alternatives include nonsense, twaddle, claptrap, rubbish, balderdash, and hogwash. All of these words essentially describe meaningless talk or foolish behavior. However, each of these terms have slightly different connotations and can be more or less appropriate depending on the context. For example, "drivel" might imply a higher degree of stupidity or pointlessness, while "twaddle" suggests foolishness without any real basis. Regardless of which synonym you choose, blithering is always a great word to add some color to a sentence.