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Related to usefulness: deteriorating, coy, inadvertently, lingering

USEFUL. That which may be put into beneficial practice.
     2. The patent act of congress of July 4, 1836, sect. 6, in describing the subjects of patents, mentions "new and useful art," and "new and useful improvement." To entitle the inventor to a patent, his invention must, to a certain extent, be beneficial to the community, and not be for an unlawful object, or frivolous, or insignificant. 1 Mason, 182; 1 Pet. C. C. R. 322; 1 Bald. 303; 14 Pick. 217; Paine, 203.

A Law Dictionary, Adapted to the Constitution and Laws of the United States. By John Bouvier. Published 1856.
References in classic literature ?
His lameness prevented him from taking much exercise; but a mind of usefulness and ingenuity seemed to furnish him with constant employment within.
(as Mr Dennis swore) the greatest possible curse a civilised community could know, and militating more against the professional emoluments and usefulness of the great constitutional office he had the honour to hold, than any adverse circumstances that could present themselves to his imagination.
My Dear Sir,--Having consented to preside at the forthcoming Annual Dinner of the Family Party Fund, and feeling deeply impressed with the immense usefulness of that noble Institution and the great importance of its being supported by a List of Stewards that shall prove to the public the interest taken in it by popular and distinguished men, I have undertaken to ask you to become a Steward on that occasion.
It was, therefore, a part of his usefulness. It had inspired confidence in his principles.
"It would destroy my usefulness," continued the other hotly.
But the world would soon be sensible of its usefulness; and he flattered himself, that a more noble, exalted thought never sprang in any other man's head.
It is true, as has been before observed that facts, too stubborn to be resisted, have produced a species of general assent to the abstract proposition that there exist material defects in our national system; but the usefulness of the concession, on the part of the old adversaries of federal measures, is destroyed by a strenuous opposition to a remedy, upon the only principles that can give it a chance of success.
There is no grain of salt in the usefulness of mobile phones but its missuses have brought great losses for humanity.
Venkatesh and Bala (2008) categorized the determinants of perceived ease of use and perceived usefulness into four different groups which are individual differences, social influence, system characteristics, and facilitating conditions.
Suba North MP Millie Odhiambo has hit out at ODM's disciplinary committee saying it 'has outlived its usefulness.'
As the country is suffering austerity, I think that all councillors should follow suit and go back to how it was some years ago when they were unpaid and of far higher usefulness to the public.
In light of this, Bhattacherjee (2001) [6] asserts that if IS user expectations are identical to use performance, perceived usefulness and use satisfaction also increase; consequently, continuation intention increases, thus fulfilling the IS Continuance Model.