Words That Rhyme With "Perniciousness" :
3 syllables:
4 syllables:
ambitiousness, auspiciousness, capriciousness, deliciousness, factitiousness, fictitiousness, flagitiousness, judiciousness, maliciousness, nutritiousness, officiousness, propitiousness, seditiousness, suspiciousness
5 syllables:
adventitiousness, avariciousness, expeditiousness, inauspiciousness, injudiciousness, repetitiousness, unpropitiousness