unsound
🇺🇸
/ˌʌnˈsaʊnd/
🇬🇧
/ˌʌnˈsaʊnd/
not solid or stable; could easily break or fall apart
The old bridge was unsound and dangerous to cross.
古い橋が不安定で、渡るのが危険でした。
not sensible or reasonable; not based on good thinking or facts
It's unsound to make such a big decision without considering all the facts.
すべての事実を考慮せずにこんな大きな決定をすることは賢明ではありません。
not correct or reliable; full of mistakes
The plan was unsound and failed to achieve its goals.
計画は理不尽で、目標を達成できませんでした。