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Definition of gadfly : Any dipterous insect of the genus Oestrus, and allied genera of botflies.

Synonyms:

nudnik, bloodsucker, pain, expletive, persecutor, grinch, blighter, hothead, stickler, critic, swearing, lad, pesterer, feller, curse, fellow, diva, swearword, teaser, cuss, pest, scourge, chap, pestis, oath, gnawer, beetle, bloke, annoyance, annoyer, plague, bother, wet blanket, purist, shrew, tease, gent, pestilence, curse word, perfectionist, fella

insect (part of speech: noun)

dung beetle, daddy longlegs, roach, may fly, bookworm, deer fly, ladybug, firefly, cockroach, dragonfly, bedbug, praying mantis, fruit fly, tiger moth, spider, silverfish, mosquito, katydid, gnat, ant, louse, cicada, scorpion, termite, bee, midge, black widow, horney, tick, nit, chinch, mite, millipede, cricket, flea, stinkbug, centipede, June bug, horntail, tarantula, tsetse fly, aphid, blowfly, scarab, fly, butterfly, wasp, housefly, horsefly, botfly, chigger, moth, mantis, boll weevil, locust, yellow jacket, grasshopper, earwig, bluebottle

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