Source : Webster's Revised Unabridged Dictionary (1913)

Immeasurable \Im*meas"ur*a*ble\, a. [Pref. im- not + measurable:
   cf. F. measurable. Cf. {Immensurable}, {Unmeasurable}.]
   Incapble of being measured; indefinitely extensive;
   illimitable; immensurable; vast.

         Of depth immeasurable.                   --Milton.

Source : WordNet®

immeasurable
     adj 1: impossible to measure; "unmeasurable reaches of outer space"
            [syn: {unmeasurable}, {immensurable}] [ant: {measurable}]
     2: beyond calculation or measure; "of incalculable value"; "an
        incomputable amount"; "jewels of inestimable value";
        "immeasurable wealth" [syn: {incomputable}, {inestimable}]