efficacious

/ˌɛfəkˈeɪʃəs/ · 4 syllables

Meaning

adjective

1. marked by qualities giving the power to produce an intended effect-Aldous Huxley
   “written propaganda is less efficacious than the habits and prejudices...of the readers”
2. producing or capable of producing an intended result or having a striking effect-LewisMumford
   “an air-cooled motor was more effective than a witch's broomstick for rapid long-distance transportation”

Synonyms for efficacious

• effective
• effectual
• hard-hitting
• impelling
• impressive
• rough-and-ready

Antonyms of efficacious

• inefficacious

Words that rhyme with efficacious

• gracious
• audacious
• fallacious
• tenacious
• crustaceous
• mendacious
• ostentatious
• perspicacious
• predaceous
• salacious
• spacious
• voracious
• capacious
• flirtatious
• herbaceous
• loquacious
• proteinaceous
• sebaceous
• vexatious
• vivacious
• ceraceous
• hellacious
• horatius