Here's what rhymes with lethargicus.
Words that almost rhyme with lethargicus
soreness haughtiness heartsickness carsickness goriness heartedness naughtiness balminess hawkishness suaveness cognisance snobbishness mawkishness morbidness responsiveness exorbitance garnishments recognisance waspishness inconspicuous intoxicants overconfidence exhaustiveness hardheartedness warmheartedness downheartedness bigheartedness accomplishments acknowledgments acknowledgements unresponsiveness admonishments kindheartedness tenderheartedness subcontinents