efficacious
/ˌefɪˈkeɪʃəs/adjective
- formal (typically of something inanimate or abstract) successful in producing a desired or intended result; effective〈正式〉（尤指无生命或抽象事物）有效的, 灵验的：
this treatment was efficacious in some cases.
该疗法有时有效。
派生词
efficaciously
adverbefficaciousness
noun词源