形容词

1. 不起作用的;徒劳无益的
If someone or something is ineffectual, they fail to do what they are expected to do or are trying to do.

1. not producing an intended effect

e.g. an ineffective teacher
ineffective legislation

Synonym: ineffectiveuneffective

2. lacking in power or forcefulness

e.g. an ineffectual ruler
like an unable phoenix in hot ashes

Synonym: ineffectiveunable

3. producing no result or effect

e.g. a futile effort
the therapy was ineffectual
an otiose undertaking
an unavailing attempt

Synonym: futileotioseunavailing