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討人厭者;有意攪擾他人者;(尤指)故意挑戰(zhàn)權(quán)威者
If you refer to someone as a gadfly, you believe that they deliberately annoy or challenge other people, especially people in authority.
例句
It still remains to be seen whether Buchanan will be just a gadfly or a real threat to the president.
布坎南只是故意攪局還是對總統(tǒng)構(gòu)成真正的威脅,這還有待觀察。