Ingenious vs ingenuous

'He was ingenuous enough to invent a better solar power cell.' Would you be happy with that sentence? Actually, he was being ingenious, which means clever or inventive.
 
Ingenuous, on the other hand, means innocent or unsophisticated: “He was ingenuous enough to believe that coal would never be replaced by renewable energy.”
 
Finally, there is the tricky negative disingenuous. It means pretending to be ingenuous. 
 
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