Meaning of the Sanskrit Word: duravapam

  duravāpam—very difficult to achieve    SB 3.4.11
  duravāpam—difficult to achieve    SB 4.8.21
  duravāpam—very difficult to understand (without the mercy of a devotee)    SB 7.6.27
  duravāpām—very difficult to obtain    SB 1.15.47-48

Can't find any compound Sanskrit words containing duravapam.