Synonyms for efficacious

Similarity of adj efficacious

2 senses of efficacious

Sense 1:

efficacious (vs. inefficacious)
effective

Also See: effective#1, effectual#1, efficacious#2

Sense 2:

effective (vs. ineffective), effectual, efficacious
hard-hitting, trenchantimpellingimpressive, tellingrough-and-ready

Also See: efficacious#1; efficient#1; potent#3, strong#4, stiff#4; powerful#1; useful#1, utile#1