Synonyms for Usefulness:

n.

efficiency, user-friendliness, synergy, worth, efficacy. used, account, use. application (noun)
fitness, use, adaptability, range, practicability, propriety, profitableness, convenience, excellence, usability, versatility.
attribute (noun)
utility.
serviceableness (noun)
utility.
utility (noun)
benefit, advantageousness, facilitation, appropriateness, instrumentality, usability, convenience, serviceability, functionality, practicality, utility, practicability, versatility, profitableness, helpfulness, merit, fittingness, suitability.
value (noun)
efficiency, utility, practicality, suitability, benefit.

Other synonyms:

efficacy, synergy, usability, convenience. efficiency, use. worth. account. flexibility
versatility.
Other relevant words:
convenience, account, efficiency, adaptability, profitableness, user-friendliness, efficacy, used, fitness, synergy, worth, range, usability, use, practicability, propriety, excellence, versatility.

Usage examples for usefulness

  1. The accident closed forever my usefulness as a public singer and rang down for me the curtain upon any future work of this kind, to my great sorrow. – Sixty Years of California Song by Margaret Blake-Alverson
  2. In point of magnitude, your little state bears much the same proportion to the united American empire, as the little world doth to the immense intelligent universe; and if the apostacy of man hath conveyed such solemn warning and instruction to the whole, as your councils have to every part of the union, no one will doubt the usefulness of Adam's fall. – Essays on the Constitution of the United States by Paul Leicester Ford
  3. Therefore, on New- Year's morning Amy stood as upon a sunny eminence, and saw her path leading away amid scenes that promised usefulness happiness, and content. – Nature's Serial Story by E. P. Roe