All effectual antonyms
ef·fec·tu·al
E e adj effectual
- incapable — not capable.
- unproductive — having the power of producing; generative; creative: a productive effort.
- useless — of no use; not serving the purpose or any purpose; unavailing or futile: It is useless to reason with him.
- impotent — not potent; lacking power or ability.
- ineffectual — not effectual; without satisfactory or decisive effect: an ineffectual remedy.
- unsuccessful — not achieving or not attended with success: an unsuccessful person; an unsuccessful venture.
- weak — not strong; liable to yield, break, or collapse under pressure or strain; fragile; frail: a weak fortress; a weak spot in armor.