sin·gle-hand·ed (also sin·gle·hand·ed / ˈsinggəlˈhandid/ ) • adv. & adj. 1. done without help from anyone else: [as adv.] sailing single-handed around the world | [as adj.] a single-handed crusade. 2. done or designed to be used with one hand: [as adv.] the tool is easy to use single-handed | [as adj.] a single-handed ax. DERIVATIVES: sin·gle-hand·ed·ly (or sin·gle·hand·ed·ly) adv.sin·gle-hand·ed·ness (or sin·gle·hand·ed·ness) n.