1. 未经保证的：unviersal incinerator 通用焚烧炉 | unwarranted 未经保证的 | unwashed 未洗涤的

2. 无根据的：unwarrantable 不允许的 | unwarranted 无根据的 | unwary 不注意的

3. 未获保证的：unwarrantable 不能保证的 | unwarranted 未获保证的 | unwarranted 未获承认的

1. 无端的；无正当理由的
    If you describe something as unwarranted, you are critical of it because there is no need or reason for it.

    e.g. Any attempt to discuss the issue of human rights was rejected as an unwarranted interference in the country''s internal affairs...
           任何讨论人权问题的尝试都会被以无端干预该国内政为由加以拒绝。
    e.g. He accused the police of using unwarranted brutality.
           他指控警方无端施暴。

1. incapable of being justified or explained

    Synonym: indefensibleinsupportableunjustifiableunwarrantable

2. lacking justification or authorization

    e.g. desire for undue private profit
           unwarranted limitations of personal freedom

    Synonym: undueunjustified

3. without a basis in reason or fact

    e.g. baseless gossip
           the allegations proved groundless
           idle fears
           unfounded suspicions
           unwarranted jealousy

    Synonym: baselessgroundlessidleunfoundedwild