(a.) Full of use, advantage, or profit; producing, or having power to produce, good; serviceable for any end or object; helpful toward advancing any purpose; beneficial; profitable; advantageous; as, vessels and instruments useful in a family; books useful for improvement; useful knowledge; useful arts.

advantageous advisable agential agentival agentive aidful appropriate assisting auspicious banausic becoming befitting beneficial benevolent bon bonny brave braw bueno capital cogent commendable commodious conducive congruous constructive contributory convenient decent desirable effective elegant employable estimable excellent expedient facilitating fair famous favorable favoring feasible felicitous fine fit fitten fitting forwarding fructuous fruitful functional furthersome gainful good good for goodly grand handy happy healthy helpful instrumental intermediary kind laudable likely mediating mediatorial meet ministerial ministering nice noble of general utility of help of service of use opportune pleasant politic positive practicable practical pragmatical productive profitable promoting proper propitious recommendable regal remedial right royal salutary seasonable seemly serviceable skillful sortable sound splendid subservient suitable therapeutic timely to be desired toward usable utilitarian valid valuable very good virtuous well-timed wise worthwhile