Synonyms for Over one's head:

• adj.

  •baffling (adjective)
  • difficult understand,
  • over ones head,
  • un clearer,
  • more bewildering,
  • hard understand,
  • un-clear,
  • un clearest,
  • un-clearest,
  • un clear,
  • un fathomable,
  • most bewildering,
  • be-wildering,
  • un-fathomable,
  • un-clearer,
  • most enigmatic,
  • be wildering,
  • over one head.
  •exorbitant (adjective)
  • out sight,
  • more absonant,
  • un-due,
  • pricier,
  • un-conscionable,
  • un duer,
  • un conscionable,
  • over much,
  • un-reasonable,
  • ex-pensive,
  • un-duer,
  • un-warranted,
  • ex acting,
  • un duest,
  • in ordinate,
  • over-board,
  • over-much,
  • un reasonable,
  • more overboard,
  • un warranted,
  • priciest,
  • over board,
  • most overboard,
  • most absonant,
  • un-duest,
  • un due,
  • ex-acting,
  • in-ordinate,
  • ex pensive.
  •uncomprehensible (adjective)
  • un-comprehensible,
  • un comprehensible.

• Other synonyms:

  •adj.
  • mystifying,
  • out of sight,
  • towering,
  • unwarranted,
  • baffling,
  • exorbitant,
  • incomprehensible,
  • overboard,
  • pricey,
  • up here,
  • Absonant,
  • up to here,
  • beyond one,
  • difficult to understand,
  • hard to understand,
  • over head.