ineffective

not working well or successfully; not producing the desired results

ineficaz, ineficiente

• be ineffective

Collocations ineffective treatment · ineffective measures

• The new drug was found to be completely ineffective.

  Se descubrió que la nueva droga era completamente ineficaz.

not successful; failing to achieve the desired result or effect

insuficiente, inadecuado

• be ineffective at doing sth

Collocations ineffective communication · ineffective leadership

• His speech was ineffective in persuading the audience.

  Su discurso fue insuficiente para convencer al público.