ben·e·fi·cial 
/ˌbɛnəˈfɪʃəl/ adjective
/ˌbɛnəˈfɪʃəl/ adjective [more beneficial; most beneficial] : producing good or helpful results or effects : producing benefits
▪ He hopes the new drug will prove beneficial to/for many people. ▪ Regular exercise has many beneficial health effects. ▪ They have a relationship that is beneficial to/for both of them. ▪ Some insects are harmful but others are beneficial.
▪ He hopes the new drug will prove beneficial to/for many people. ▪ Regular exercise has many beneficial health effects. ▪ They have a relationship that is beneficial to/for both of them. ▪ Some insects are harmful but others are beneficial.
— ben·e·fi·cial·ly adverb
