adj. 25B6; adjective
a useful multi-purpose tool : FUNCTIONAL, practical, handy, convenient, utilitarian, serviceable, of use, of service; informal nifty.
a useful experience : BENEFICIAL, advantageous, helpful, worthwhile, profitable, rewarding, productive, constructive, valuable, fruitful.
(informal) they had some very useful players : COMPETENT, capable, able, skilful, skilled, talented, proficient, accomplished, good, handy.
useless, disadvantageous, incompetent.