gadfly gade • gadge · · · Info · Definitions · Synonyms · Characters · · gadfly · · Text Latin · · Script 6 · · Length Definitions · · · (noun) a persistently annoying person. Synonyms: pest, blighter, cuss, pesterer. · · Noun Definition 1 (noun) any of various large flies that annoy livestock. · · Noun Definition 2 Synonyms · · · pest · · Synonym 1 blighter · · Synonym 2 cuss · · Synonym 3 pesterer · · Synonym 4 Characters · · a latin small letter a U+0061 d latin small letter d U+0064 f latin small letter f U+0066 g latin small letter g U+0067 l latin small letter l U+006C y latin small letter y U+0079