ineffectual

1. ADJ If someone or something is ineffectual, they fail to do what they are expected to do or are trying to do. 无能的; 无效的

The mayor had become ineffectual in the struggle to clamp down on drugs. 该市长在打击毒品的斗争中行动不力。

2. ineffectuallyADV 无效地

Her voice trailed off ineffectually. 她的声音渐渐微弱得听不见了。