1. effective

adjective. (ɪˈfɛktɪv, ˈiːfɛktɪv) Producing or capable of producing an intended result or having a striking effect.
Antonyms
inefficient impotent useless ineffective ineffectiveness powerless unprofitable
Synonyms
effectuality efficacious effectualness hard-hitting effectual
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2. cost-effective

adjective. Productive relative to the cost.
Antonyms
inefficient ineffective incompetent
Synonyms
cost-efficient

3. effective

adjective. (ɪˈfɛktɪv, ˈiːfɛktɪv) Able to accomplish a purpose; functioning effectively.
Antonyms
incompetent unaggressive invalid
Synonyms
competent

4. effective

adjective. (ɪˈfɛktɪv, ˈiːfɛktɪv) Works well as a means or remedy.
Antonyms
inefficacious inexpedient
Synonyms
efficacious

5. effective

adjective. (ɪˈfɛktɪv, ˈiːfɛktɪv) Exerting force or influence.
Antonyms
inoperative unhelpful inutility uselessness unserviceable
Synonyms
operative in force in effect

6. effective

adjective. (ɪˈfɛktɪv, ˈiːfɛktɪv) Existing in fact; not theoretical; real.
Antonyms
potential powerlessness inefficacy
Synonyms
actual

7. effective

adjective. (ɪˈfɛktɪv, ˈiːfɛktɪv) Ready for service.
Antonyms
nonoperational frail
Synonyms
operational
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