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)