ineffective
[adjective]
Synonyms: useless, fruitless, futile, idle, impotent, inefficient, unavailing, unproductive, vain, worthless

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Antonyms: effective
Contrasted words: active, effectual, efficacious, esteemed, valuable
Related Words: inadequate, incompetent, inferior, useless, worthless

[TahlilGaran] English Synonym Dictionary ▲

in‧ef‧fec‧tive /ˌɪnəˈfektɪv◂, ˌɪnɪˈfektɪv◂/ adjective
[Word Family: noun: effect, effectiveness ≠ ineffectiveness; adjective: effective ≠ ineffective, effectual ≠ ineffectual; verb: effect; adverb: effectively ≠ ineffectively]
something that is ineffective does not achieve what it is intended to achieve Antonym : effective
ineffective in doing something
The chemical was almost totally ineffective in killing the weeds.
ineffective against
Various drugs have proved ineffective against the virus.
an ineffective marketing campaign
—ineffectively adverb
—ineffectiveness noun [uncountable]:
the ineffectiveness of most diets

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In everyday English, people usually say that something does not work rather than saying that it is ineffective:
These drugs don’t work against bird flu.

[TahlilGaran] Dictionary of Contemporary English ▲

ineffective
adj.
VERBS be, prove, seem These policies have proved ineffective.
become | make sth, render sth The contract was rendered ineffective by this careless wording.
ADV. highly, singularly, very | completely, entirely, totally, wholly | largely | pretty, rather, relatively, somewhat | apparently | politically
PREP. against These weapons are totally ineffective against tanks.
in chemicals that are very ineffective in killing weeds

[TahlilGaran] Collocations Dictionary ▲