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un·sound / ˌənˈsound/ • adj. not safe or robust; in poor condition: the tower is structurally unsound. ∎  not based on sound evidence or reasoning and therefore unreliable or unacceptable: unsafe and unsound banking practices. ∎  (of a person) not competent, reliable, or holding acceptable views. ∎  injured, ill, or diseased, esp. (of a horse) lame.DERIVATIVES: un·sound·ly adv.un·sound·ness n.