hoar·y / ˈhôrē/ • adj. (hoar·i·er, hoar·i·est) 1. grayish-white: hoary cobwebs. ∎ (of a person) having gray or white hair; aged: a hoary old fellow with a face of white stubble. ∎ used in names of animals and plants covered with whitish fur or short hairs, e.g., hoary bat, hoary cress.2. old and trite: that hoary American notion that bigger is better.DERIVATIVES: hoar·i·ly / ˈhôrəlē/ adv.hoar·i·ness n.