#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"
  supertype:  negative_stimulus  a stimulus with undesirable consequences
  subtype:  bugaboo  a source of concern; "the old bugaboo of inflation still bothers them"
  subtype:  onus__burden__load__encumbrance  an onerous or difficult concern; "the burden of responsibility"; "that's a load off my mind"
     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"
  subtype:  business.headache  a rightful concern or responsibility; used in such phrases as "it's none of your business" or "mind your own business"

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