Source : Webster's Revised Unabridged Dictionary (1913)

Incomputable \In`com*put"a*ble\, a.
   Not computable.

Source : WordNet®

incomputable
     adj : beyond calculation or measure; "of incalculable value"; "an
           incomputable amount"; "jewels of inestimable value";
           "immeasurable wealth" [syn: {inestimable}, {immeasurable}]