unsound
adjective uk/ʌnˈsaʊnd/ us/ʌnˈsaʊnd/
(NOT ACCEPTABLE)
（人的活动或判断）不够好的;不可接受的;靠不住的
If a person's activities or judgment are unsound, they are not good enough, acceptable, or able to be trusted.
unsound accounting practices 不规范的会计行为
unsound police evidence 不确凿的警方证据
(WEAK)
（建筑）有安全隐患的，不坚固的
If a building or other structure is unsound, it is in bad condition and likely to fall down or fail.
The bridge is one of several said to be structurally unsound. 这座桥是据说结构上有问题的几座桥梁之一。
Synonyms: shaky (WEAK)unstable