flavourless

from WordNet (r) 3.0 (2006)

flavourless
    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}]

from The Collaborative International Dictionary of English v.0.48

flavourless \flavourless\ adj.
   same as {flavorless}. [Chiefly Brit.]

   Syn: bland, flat, flavorless, insipid, savorless.
        [WordNet 1.5]