ineffectual
🇺🇸
/ˌɪnɪˈfektʃuəl/
🇬🇧
/ˌɪnɪˈfektʃuəl/
adjective
R
Lacking the power to produce a desired effect; weak and unable to achieve goals.
Despite his ineffectual attempts, the door remained locked.
儘管他嘗試無效，門還是鎖著的。
translation
無效的