giving or rendering aid or assistance; of service: Your comments were very helpful.

1300–50; Middle English; see help, -ful

helpfully, adverb
helpfulness, noun
overhelpful, adjective
overhelpfully, adverb
overhelpfulness, noun
quasi-helpful, adjective
quasi-helpfully, adverb
unhelpful, adjective
unhelpfully, adverb

useful, convenient; beneficial, advantageous.

useless, inconvenient. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
helpful (ˈhɛlpfʊl)
serving a useful function; giving help

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
What was once regarded as beneficial has proved to be less helpful than advertised or even potentially harmful to your health.
Various all-digital campuses could collaborate to develop specifications for
  such helpful software as well as open-source tools.
Being able to create genetic variants of prairie voles to order would therefore
  be helpful to research.
Mustard also contains vinegar, which some people find helpful against heartburn.
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