bland in WordNet English dictionary

1. smoothly agreeable and courteous with a degree of sophistication
   "he was too politic to quarrel with so important a personage"; "the manager pacified the customer with a smooth apology for the error"
   politic  smooth  suave  bland 
   
2. lacking taste or flavor or tang
   "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"; "vapid beer"; "vapid tea"
   bland  flat  flavorless  flavourless  insipid  savorless  savourless  vapid 
   
3. lacking stimulating characteristics; uninteresting
   "a bland little drama"; "a flat joke"
   bland  flat