We found one dictionary that defines the word blithering idiots:

General (1 matching dictionary)

1. blithering idiots: Cambridge Advanced Learner's Dictionary

▸ Words similar to blithering idiots ▸ Usage examples for blithering idiots ▸ Idioms related to blithering idiots ▸ Wikipedia articles (New!) ▸ Words that often appear near blithering idiots ▸ Rhymes of blithering idiots ▸ Invented words related to blithering idiots