Here's what rhymes with presumptuously.
sumptuously Words that almost rhyme with presumptuously
company suddenly subtly hungrily huskily sulkily accompany subtlety clumsily luckily lustily slovenly wondrously frontally tumultuously custody reluctantly husbandry redundancy triumphantly uncomfortably drunkenly incumbency pungency exultantly puppetry abundantly musketry gluttony unluckily indulgently perfunctorily ineluctably consultancy compulsorily microscopy