Source : Webster's Revised Unabridged Dictionary (1913)

Interminable \In*ter"mi*na*ble\, a. [L. interminabilis: cf. F.
   interminable. See {Terminate}.]
   Without termination; admitting no limit; boundless; endless;
   wearisomely protracted; as, interminable space or duration;
   interminable sufferings.

         That wild interminable waste of waves.   --Grainger.

   Syn: Boundless; endless; limitless; illimitable;
        immeasurable; infinite; unbounded; unlimited.

Source : WordNet®

interminable
     adj : tiresomely long; seemingly without end; "endless debates";
           "an endless conversation"; "the wait seemed eternal";
           "eternal quarreling"; "an interminable sermon" [syn: {endless},
            {eternal}]