efficacious
🇺🇸
/ˌefɪˈkeɪʃəs/
🇬🇧
/ˌefɪˈkeɪʃəs/
adjective
R
works well and produces the result you wanted
Drinking a lot of water is efficacious for staying hydrated.
喝大量的水對保持水分很有效。
translation
有效的