inefficacious

An obsolete adjective meaning not producing the desired effect; ineffective.

ruУстаревшее прилагательное, означающее не производящее желаемого эффекта; неэффективный.esAdjetivo poco usado que significa que no produce el efecto deseado o que es ineficaz, sin resultado útil.frAdjectif signifiant qui ne produit pas l’effet désiré ; inefficace, sans résultat.deVeraltetes Adjektiv, das bedeutet, nicht die gewünschte Wirkung erzielend; unwirksam oder erfolglos.ptAdjetivo pouco comum ou literário que significa que não produz o efeito desejado; ineficaz.zh过时的形容词，指不能产生预期效果的；无效的。arصفة تعني عدم إنتاج الأثر أو النتيجة المرجوة؛ غير نافع ولا يحقق الغرض المطلوب منه.

1. Lacking effectiveness C2 formal

   Not having the ability to produce the intended or desired result; ineffective.

   • The treatment proved inefficacious against the disease.
   • His inefficacious attempts to solve the problem only made things worse.
   • The committee deemed the old policy inefficacious and proposed a new one.

   ruНеэффективныйesIneficazfrinefficacedeUnwirksamptIneficazzh无效的arغير فعّال

   Synonyme: fruitlessfutileineffectiveineffectualunavailingunproductiveunsuccessfuluselessvain

   Antonyme: effectiveeffectualefficaciousproductive

• more inefficacious comparative form
• most inefficacious superlative form