• redoubtable

    If you describe someone as redoubtable, you have great respect for their power and strength; you may be afraid of them as well.

  • dubious

    If someone makes a dubious claim, there is a great deal of disbelief or doubt about it.

  • indubitable

    A conclusion or statement that is indubitable is certain, unquestionable, or true beyond the shadow of a doubt.

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