bland

Adjective
  1. Lacking taste or flavor or tang (synset 302408319)
    "a bland diet"; "insipid hospital food"; "flavorless supermarket tomatoes"; "vapid beer"; "vapid tea"
  2. Lacking stimulating characteristics;
    Uninteresting (synset 302315243)
    "a bland little drama"; "a flat joke"
  3. Smoothly agreeable and courteous with a degree of sophistication (synset 300762345)
    "he was too politic to quarrel with so important a personage"; "the manager pacified the customer with a smooth apology for the error"

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