Countless/ˈkaʊntləs/ Definition 1 of 1Pro Tip 1/3Frequency Overload Used when something happens so often that it's hard to quantify. I've reminded you countless times to lock the door! Pro Tip 2/3Hyperbolic Impact Creates emphasis and suggests that something is beyond measure. She had countless admirers following her performance. Pro Tip 3/3Implied Vastness Often used to express the vastness of something that can't be easily quantified. Countless people have walked this path before us.