The Collaborative International Dictionary of English v.0.48:

Savorless \Sa"vor*less\, a.
   Having no savor; destitute of smell or of taste; insipid.
   [1913 Webster]

WordNet (r) 3.0 (2006):

savorless
    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, insipid, savorless, savourless,
           vapid]

Moby Thesaurus II by Grady Ward, 1.0:

34 Moby Thesaurus words for "savorless":
   bland, dead, dilute, diluted, distasteful, fade, flat, flavorless,
   gruelly, ill-flavored, inane, indifferent, insipid, jejune, mild,
   milk-and-water, pappy, pulpy, sapless, spiceless, stale, tasteless,
   thin, unappetizing, unflavored, unpleasing, unsavory, vapid, washy,
   watered, watered-down, watery, weak, wishy-washy