English efficacious

← English (suffix)

← English -ous (suffix)

← English effect (mention)

← Old French efficacieux (derived)

← Latin efficāx (derived)

← Latin efficere (mention)

→ English efficacy (mention)

→ English inefficacious (prefix)

→ English unefficacious (prefix)

→ English efficaciously (suffix)

→ English efficaciousness (suffix)

→ English subefficacious (prefix)

→ English nonefficacious (prefix)