useful

[yoos-fuhl]
adjective
1.
being of use or service; serving some purpose; advantageous, helpful, or of good effect: a useful member of society.
2.
of practical use, as for doing work; producing material results; supplying common needs: the useful arts; useful work.

Origin:
1585–95; use + -ful

usefully, adverb
usefulness, noun
unuseful, adjective
unusefully, adverb
unusefulness, noun


1, 2. profitable, efficacious, beneficial.


1, 2. useless.
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World English Dictionary
useful (ˈjuːsfʊl)
 
adj
1.  able to be used advantageously, beneficially, or for several purposes; helpful or serviceable
2.  informal commendable or capable: a useful term's work
 
n
3.  informal (Austral) an odd-jobman or general factotum
 
'usefully
 
adv
 
'usefulness
 
n

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
Many universities have put their career information online, and these sites are
  useful for anyone seeking an academic job.
Yet for all its weirdness, antimatter is real not fictional, and has already
  proved useful in medicine.
Ohm's law is useful to explain currents in copper wires.
He was also a useful antidote against a certain strain of biological
  romanticism.
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