(n.) A burden; an obligation; as, the onus of feeding a family\.

absolute indication allegiance arraignability arraignableness aspersion assigned task attaint badge of infamy bar sinister baton bend sinister black eye black mark blameworthiness bloody hands blot blur bounden duty brand broad arrow burden burden of proof burthen business call of duty cargo censurability censurableness censure champain charge chargeability commitment complicity conclusive evidence criminality cross culpability cumbrance damning evidence deadweight dedication deference demonstration determination devoir devotion difficulty dirty hands disadvantage disparagement duties and responsibilities duty embarrassment encumbrance establishment ethics fault fealty freight guilt guiltiness guilty conscience hamper handicap homage impeachability impeachableness impediment impedimenta imperative implication imposition imputation incontrovertible evidence inconvenience inculpation indictability indictableness indisputable evidence involvement ironclad proof line of duty load loyalty lumber mark of Cain millstone mission must obligation odium onus probandi ought pack peccancy penalty pillorying place point champain proof red-handedness reflection reprehensibility reprimand reproach reproachableness reprovability reprovableness respect self-imposed duty settlement slur smear smirch smudge smutch spot stain stigma stigmatism stigmatization sure sign taint tarnish task tax trouble unmistakable sign weight white elephant