Unstoppable/ʌnˈstɑːpəbl/ Definition 1 of 3Pro Tip 1/3Use with Challenges Apply 'unstoppable' when talking about overcoming difficulties or challenges. She approached every problem with an unstoppable spirit. Pro Tip 2/3Positive Connotation 'Unstoppable' often implies a positive quality, such as strength or determination. With an unstoppable attitude, he triumphed over adversity. Pro Tip 3/3Metaphorical Usage Frequently used metaphorically to describe non-physical things. The spread of information through social media is unstoppable.