Mammoth Uncensored Word List:
216 words ending with ss, 16 letters long

absentmindedness accumulativeness advantageousness ambidextrousness appreciativeness apprehensiveness asynchronousness blackheartedness bloodthirstiness bloodymindedness braveheartedness broadheartedness cantankerousness communicableness conservativeness constitutionless constructiveness contemptibleness contemptuousness creditworthiness cringeworthiness cruelheartedness curmudgeonliness deliberativeness demonstrableness destructibleness determinableness disagreeableness disconcertedness disconnectedness disconsolateness discontentedness discourteousness dishonorableness disingenuousness disputatiousness disreputableness doublehandedness dumbfoundingness emptyheartedness exaggerativeness excruciatingness faintheartedness falseheartedness feeblemindedness flightworthiness frankheartedness greatheartedness heavyheartedness hypercorrectness hypersensualness immeasurableness imperceptiveness imperishableness inarticulateness inauspiciousness incommodiousness inconclusiveness inconsolableness incorrigibleness indigestibleness indisputableness indissolubleness inexplicableness inexpressiveness inexpugnableness infelicitousness inharmoniousness inhospitableness insufferableness intellectualness intelligibleness intermediateness interminableness intermissionless interrelatedness intransitiveness invulnerableness irremediableness irresistibleness irresponsiveness landlubberliness largeheartedness lightheartedness liverheartedness malcontentedness manipulativeness meretriciousness muddleheadedness multifariousness narrowmindedness nonarbitrariness nonexcitableness nonexcusableness nonmelodiousness nonreligiousness nonresistiveness nonseclusiveness nonselectiveness nonsensitiveness nontalkativeness nonteachableness nontolerableness nontraceableness nontransientness nontyrannousness obstreperousness opinionativeness ostentatiousness otherworldliness overcautiousness overcovetousness overcriticalness overindebtedness overmercifulness overpopulousness overpositiveness overreachingness overspaciousness overstraightness overstudiousness overtrustfulness overtruthfulness overvaluableness overvigorousness overwhelmingness parsimoniousness pertinaciousness praiseworthiness premeditatedness preposterousness prescriptiveness presumptuousness propertylessness pseudonymousness puzzleheadedness quantitativeness questionableness rambunctiousness remunerativeness reproductiveness roughheartedness sacrilegiousness satisfactoriness secondhandedness semiluminousness semimysticalness sharpsightedness shortsightedness simplemindedness simultaneousness singlehandedness singlemindedness soporiferousness spendthriftiness steelheartedness stepmotherliness stoutheartedness stronghandedness strongheadedness subconsciousness superciliousness supernaturalness superseriousness superstitionless superstylishness superzealousness toughheartedness unacceptableness unaccustomedness unachievableness unacquaintedness unanswerableness unappealableness unappeasableness unappetisingness unappetizingness unapprovableness unascendableness unassailableness unassessableness unattainableness unattractiveness unauspiciousness unauthorisedness unauthorizedness unbelievableness uncalculableness unchangeableness uncharitableness unconvincingness undependableness undeterminedness unfavourableness unhospitableness unimpressiveness unlugubriousness unmanageableness unneighborliness unnoticeableness unprincipledness unproductiveness unprofitableness unreasonableness unresponsiveness unrestrainedness unrestrictedness unscrupulousness unseasonableness unthoughtfulness userfriendliness vaingloriousness weatherproofness weathertightness wholeheartedness wrongheartedness