Source : Webster's Revised Unabridged Dictionary (1913)

Insistent \In*sist"ent\, a. [L. insistens, -entis, p. pr. of
   insistere.]
   1. Standing or resting on something; as, an insistent wall.
      --Sir H. Wotton.

   2. Insisting; persistent; persevering.

   3. (Zo["o]l.) See {Incumbent}.

Source : WordNet®

insistent
     adj 1: persistently continual; "the bluejay's insistent cry" [syn:
            {repetitive}]
     2: demanding attention; "clamant needs"; "a crying need";
        "regarded literary questions as exigent and momentous"-
        H.L.Mencken; "insistent hunger"; "an instant need" [syn: {clamant},
         {crying}, {exigent}, {instant}]