adj.腐爛變質(zhì)的；謬誤的；無根據(jù)的；靠不住的
In theory as well as in practice, the idea is unsound. 這個主意在理論上和實踐上都站不住腳。
Do not listen to unsound advice. 別去聽無根據(jù)的勸告。
I am afraid that it is an unsound investment. 我擔(dān)心這項投資靠不住。
