Here's what rhymes with credulous.
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perilous garrulous pendulous querulous levelness evidence emphasis excellence prevalence regiments relevance resonance arrogance edifice elegance eminence genesis exodus mellitus precipice nebulous tremulous venomous clarinets mechanise redolence djellabas marabous jellabas elements estimates eloquence elephants precedence stenosis decadence gentleness pestilence sensuous tenuous tetanus blessedness recklessness requisites irrelevance malevolence carefulness emeritus petulance baronets fretfulness preciousness megabits restfulness dreadfulness terribleness testiness decimates airlessness heftiness edibleness negligence specialists benevolence emigrants feminists precedents carelessness membranous restlessness tenements asparagus preeminence helpfulness pleasantness breathlessness registrants endlessness healthfulness decadents directionless fecklessness sensibleness tepidness fetidness zestfulness intelligence inheritance sentiments settlements sediments forgetfulness helplessness beneficence hydrocephalus licentiousness preparedness overemphasis testaments celebrants interrogates senselessness detriments eventfulness resentfulness nonvenomous neglectfulness experiments pathogenesis prerequisites temperaments unpleasantness conscientiousness morphogenesis nonresidents pretentiousness contentiousness infectiousness relentlessness impetuousness momentousness respectfulness portentousness secondments housemistress dextrousness developments impediments embarrassments angiogenesis embryogenesis geneticists integuments presentiments unpreparedness nonspecialists perfectionists defencelessness defenselessness tendentiousness contemptuousness tempestuousness incestuousness gluconeogenesis disinheritance redevelopments spermatogenesis