might·y / ˈmītē/ • adj. (might·i·er, might·i·est) possessing great and impressive power or strength, esp on account of size: three mighty industrial countries mighty beasts. ∎ (of an action) performed with or requiring great strength: a mighty heave | fig. a mighty blow against racism. ∎ inf. very large: she gave a mighty hiccup.• adv. inf. extremely: this is mighty early to be planning a presidential campaign.DERIVATIVES: might·i·ly / ˈmītl-ē/ adv.might·i·ness n.