characterized by cleverness or originality of invention or construction: an ingenious machine.
cleverly inventive or resourceful: an ingenious press agent.
intelligent; showing genius.

1375–1425; late Middle English < Latin ingeniōsus, equivalent to ingeni(um) natural disposition, cleverness (in- in-2 + gen- (base of gignere to bring into being; cf. genitor) + -ium -ium) + -ōsus -ous

ingeniously, adverb
ingeniousness, noun
half-ingenious, adjective
half-ingeniously, adverb
half-ingeniousness, noun
overingenious, adjective
overingeniously, adverb
overingeniousness, noun
superingenious, adjective
superingeniously, adverb
superingeniousness, noun

ingenious, ingenuous (see usage note at the current entry).

2. bright, gifted, able, resourceful; adroit.

2. unskillful.

Ingenious and ingenuous are now distinct from each other and are not synonyms. Ingenious means “characterized by cleverness” or “cleverly inventive,” as in contriving new explanations or methods: an ingenious device; ingenious designers. Ingenuous means “candid” or “innocent”: an ingenuous and sincere statement; a thug with the ingenuous eyes of a choirboy. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
ingenious (ɪnˈdʒiːnjəs, -nɪəs)
1.  possessing or done with ingenuity; skilful or clever
2.  obsolete having great intelligence; displaying genius
[C15: from Latin ingeniōsus, from ingenium natural ability; see engine]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

late 15c., "intellectual, talented," from M.Fr. ingénieux "clever, ingenious" (O.Fr. engeignos), from L. ingeniosus "of good capacity, gifted with genius," from ingenium "innate qualities, ability," lit. "that which is inborn," from in- "in" + gignere, from PIE *gen- "produce." Sense of "skillful,
clever" first recorded 1540s.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
The success of the mini was down to its ingenious technological design.
Some of their survival strategies are nothing short of ingenious.
We have been trying for years to fix problems using our ingenious ideas.
Nature has perfected an ingenious way of turning light into chemical energy and
  storing it up.
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