useless having no beneficial use or incapable of functioning usefully; "a kitchen full of useless gadgets"; "she is useless in an emergency"
effectual,
efficacious,
effective marked by qualities giving the power to produce an intended effect; "written propaganda is less efficacious than the habits and prejudices...of the readers"-Aldous Huxley; "the medicine is efficacious in stopping a cough"
expedient serving to promote your interest; "was merciful only when mercy was expedient"
helpful providing assistance or serving a useful function
profitable yielding material gain or profit; "profitable speculation on the stock market"
serviceable intended or able to serve a purpose without elaboration; "serviceable low-heeled shoes";
usefulness,
utility the service (electric power or water or transportation) provided by a public utility; "the cost of utilities never decreases"; "all the utilities were lost after the hurricane"
multipurpose having multiple uses; "a multipurpose tool"
