incomprehensible; mysterious; inexplicable; inscrutable; enigmatic; baffling
mystery; something inexplicable; unfathomable (of a Buddha's abilities); 10^64 (or 10^80)
act of God; irresistible force; inevitability; force majeure; vis major
inseparable; indivisible; undetachable
the unobtainable (that which cannot be known)
unavailable (stock, etc.)
unavailable; not able to respond; impossible to fulfil (demand, request, etc.); incompatible (e.g. device); unsupported
10^37218383881977644441306597687849648128; 10^(7x2^122)
non-rebuildable property; property on which new buildings cannot legally be erected because it lacks access to a road that is at least 4 meters wide