not safe or robust; in poor condition 不安全的;不健康的,情况不佳的 the tower is structurally unsound. 那座塔结构不良。 ■not based on sound evidence or reasoning and therefore unreliable or unacceptable 无根据的;不牢靠的;不可接受的 activities deemed to be environmentally unsound. 被认为是不利于环境的活动。 ■(of a person) not competent, reliable, or holding acceptable views (人)不称职的;不可靠的;持错误观点的 ■injured, ill, or diseased, especially (of a horse) lame 受伤的;生病的;(尤指马)瘸的