Words That Rhyme With "Perniciously" :

3 syllables:

viciously

4 syllables:

ambitiously, auspiciously, capriciously, factitiously, fictitiously, flagitiously, judiciously, maliciously, officiously, propitiously, seditiously, suspiciously

5 syllables:

adscititiously, adventitiously, avariciously, expeditiously, inauspiciously, injudiciously, obreptitiously, superstitiously, surreptitiously, unpropitiously