ineffective

• 指没有产生预期效果或结果的；不起作用的。

Describes something that does not produce the desired effect or result; not effective.

1. Not producing an intended effectB2formal

   Failing to achieve the desired result or purpose.

   无效的

   • The medication proved ineffective against the new strain.
   • His attempts to negotiate were ineffective.
   • The marketing campaign was largely ineffective and did not boost sales.

   同义词fruitlessfutileineffectualinefficaciousinefficientunavailingunproductiveunsuccessfuluselessvain

   反义词effectiveefficaciousoperativepotentproductivesuccessful

2. Lacking power or forcefulnessB2formal

   Without sufficient strength, power, or force to be effective.

   无效的

   • The speech was ineffective and failed to inspire the audience.
   • Her arguments were ineffective against his clear logic.
   • The protest was ineffective because it was too small.

   同义词feeblefutileimpotentineffectualinefficaciouspowerlesstoothlessunavailinguselessweak

   反义词effectiveefficaciousforcefulpotentpowerfulstrong

3. Lacking ability or skillB2formal

   Lacking the necessary skill, competence, or ability to perform effectively; inadequate.

   无能的

   • He was an ineffective manager who could not lead the team.
   • The teacher was considered ineffective by the parents.
   • She felt ineffective in the new role due to lack of training.

   同义词inadequateincapableincompetentineptunfitunqualifiedunskilled

   反义词ableadeptcapablecompetenteffectiveefficientproficientskilledskillful