#onus__burden__load__encumbrance  an onerous or difficult concern; "the burden of responsibility"; "that's a load off my mind"
  supertype:  headache__concern__worry__vexation  something or someone that causes anxiety; a source of unhappiness; "New York traffic is a constant concern"; "it's a major worry"
  subtype:  dead_weight.onus__deadweight  an oppressive encumbrance
  subtype:  fardel  (archaic) a burden (figuratively in the form of a bundle)
  subtype:  imposition.onus  an uncalled-for burden; "he listened but resented the imposition"

No statement uses or specializes onus; click here to add one.