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inefficacious

adjective

antonyms

• efficacious

related terms

• ineffective
• ineffectual
• uneffective

sounds kind of like

• iambic
• iambus
• impasse
• impeach
• impious
• impish
• impose
• in a big way
• in a pig's eye
• in vogue
• inefficacy
• infix
• infuse
• inveigh
• invoice
• invoke