WordNet: inefficacious

lacking the power to produce a desired effect; "laws that are inefficacious in stopping crime"

• also see ineffective, ineffectual, uneffective

• attribute efficaciousness, efficacy

inefficacious

• (englanti) efficacious (antonym)

• (englanti) inefficaciousness (derivationally related)
• (suomi) tehoton (synonyymi)