Synonyms/Hypernyms (Ordered by Estimated Frequency) of noun gadfly

2 senses of gadfly

Sense 1
pest, blighter, cuss, pesterer, gadfly -- (a persistently annoying person)
       => tormentor, tormenter, persecutor -- (someone who torments)

Sense 2
gadfly -- (any of various large flies that annoy livestock)
       => fly -- (two-winged insects characterized by active flight)