Ready for service or able to give long service.

Roget 644: useful; of use etc. n.; serviceable, proficuous^†, good for; subservient etc. (instrumental) 631; conducive etc. (tending) 176; subsidiary etc. (helping) 707.    advantageous etc. (beneficial) 648; profitable, gainful, remunerative, worth one's salt; valuable; prolific etc. (productive) 168.    adequate; efficient, efficacious; effective, effectual; expedient etc. 646.    applicable, available, ready, handy, at hand, tangible; commodious, adaptable; of all work.    ... show more

Roget 648: harmless, hurtless^†; unobnoxious^†, innocuous, innocent, inoffensive.    beneficial, valuable, of value; serviceable etc. (useful) 644; advantageous, edifying, profitable; salutary etc. (healthful) 656.    favorable; propitious etc. (hope-giving) 858; fair.    good, good as gold; excellent; better; superior etc. 33; above par; nice, fine; genuine etc. (true) 494.    best, choice, select, picked, elect, recherche, rare, priceless; unparagoned^†, unparalleled etc. (supreme) 33; superlatively etc. 33; good; bully [Slang], crackajack [Slang], giltedged; superfine, superexcellent^†; of the first water; first-rate, first-class; high-wrought, exquisite, very best, crack, prime, tiptop, capital, cardinal; standard etc. (perfect) 650; inimitable.    admirable, estimable; praiseworthy etc. (approve) 931; pleasing etc. 829; couleur de rose [Fr.], precious, of great price; costly etc. (dear) 814; worth its weight in gold, worth a Jew's eye; priceless, invaluable, inestimable, precious as the apple of the eye.    tolerable etc. (not very good) 651; up to the mark, unexceptionable, unobjectionable; satisfactory, tidy.    in good condition, in fair condition; fresh; sound etc. (perfect) 650.    ... show more

Capable of being put to good use.

Intended or able to serve a purpose without elaboration.