useful

英['juːsfʊl;-f(ə)l] 美['jusfl]

1. being of use or service;

"the girl felt motherly and useful"

"a useful job"

"a useful member of society"

2. of great importance or use or service;

"useful information"

"valuable advice"

3. capable of being turned to use or account;

"useful applications of calculus"

4. having a useful function;

"utilitarian steel tables"