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59 words ending with ss, 17 letters long

accommodativeness adventuresomeness authoritativeness communicativeness companionableness compassionateness complementariness comprehensiveness conscientiousness consequentialness contemplativeness contradictoriness demonstrativeness directionlessness disadvantagedness disinterestedness dispassionateness disrespectfulness extraordinariness gentlemanlikeness heterogeneousness inappropriateness inconceivableness inconsiderateness inconspicuousness indefatigableness indescribableness indeterminateness indispensableness inefficaciousness inexhaustibleness inexpressibleness instantaneousness introspectiveness irrecoverableness irreplaceableness irresponsibleness knowledgeableness miscellaneousness multitudinousness nonproductiveness objectionableness overambitiousness oversensitiveness ovoviviparousness perspicaciousness prefigurativeness preternaturalness reprehensibleness revolutionariness sanctimoniousness semiconsciousness splendiferousness structurelessness tenderheartedness unceremoniousness uncompetitiveness unfashionableness unpretentiousness