Source : Webster's Revised Unabridged Dictionary (1913)

Insipid \In*sip"id\, a. [L. insipidus; pref. in- not + sapidus
   savory, fr. sapere to taste: cf. F. insipide. See {Savor}.]
   1. Wanting in the qualities which affect the organs of taste;
      without taste or savor; vapid; tasteless; as, insipid
      drink or food. --Boyle.

   2. Wanting in spirit, life, or animation; uninteresting;
      weak; vapid; flat; dull; heavy; as, an insipid woman; an
      insipid composition.

            Flat, insipid, and ridiculous stuff to him. --South.

            But his wit is faint, and his salt, if I may dare to
            say so, almost insipid.               --Dryden.

   Syn: Tasteless; vapid; dull; spiritless; unanimated;
        lifeless; flat; stale; pointless; uninteresting.

Source : WordNet®

insipid
     adj 1: lacking taste or flavor or tang; "a bland diet"; "insipid
            hospital food"; "flavorless supermarket tomatoes";
            "vapid beer"; "vapid tea" [syn: {bland}, {flat}, {flavorless},
             {flavourless}, {savorless}, {savourless}, {vapid}]
     2: lacking significance or impact; "an insipid novel"
     3: lacking interest or significance; "an insipid personality";
        "jejune novel" [syn: {jejune}]
     4: not pleasing to the sense of taste [syn: {tasteless}]