What is a common characteristic of something deemed formidable?

When something is described as formidable, it conveys a sense of strength, power, or capability that is both impressive and intimidating. A formidable opponent, for instance, is one who possesses significant skills or resources that command respect and pose a serious challenge. This term often suggests that the entity is not only powerful but also evokes admiration or fear because of its impressive nature and potential impact.

In this context, the other choices do not align with the meaning of formidable. Something that is unpredictable lacks the consistent strength or impressive capability associated with being formidable. Harmless implies a lack of threat or significant impact, which contradicts the essence of being formidable. Lastly, insignificance denotes a lack of importance or influence, again contrasting with the powerful nature of something deemed formidable.