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
the unobtainable (that which cannot be known)
unavailable (stock, etc.)
10^37218383881977644441306597687849648128; 10^(7x2^122)