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Let's say someone has an idea that he/she thinks is really good, but in reality it is actually not a very good idea. How can I describe this kind of mentality?

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Do they know it is bad, and still consider it good? – Mohit Jan 16 '13 at 8:16
Happens all the time. It's properly called "mistaken" or "wrongheaded", as in "That's an interesting idea, but decidedly wrongheaded". And if, as Mohit asks, the person knows it's bad but still thinks it's good, I think we can call it "twisted". – user21497 Jan 16 '13 at 8:27
misguided, perhaps? – FumbleFingers Jan 16 '13 at 19:21

Quixotic might be appropriate in some circumstances. One of its meanings is 'naively idealistic'.

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Incorrect, blindly supportive, näively enthusiastic.

If someone continues to support an idea after it has been fully demonstrated as bad, you might consider them to be a mumpsimus (that word would also apply to the idea, as well as the person).

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I suggest these terms & phrases. They may help:


2-Side effect or adverse effect

3-Tastes bad, works well

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In my experience, folly comes very close to the answer.

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"Foolish" or "Fool", "idiotic" is also good. Senseless is another fun term.

"Buying seventeen buckets of frogs is idiotic." "He's an idiot for snowboarding off the roof.", "That's the most foolish idea I've ever seen."

Senseless is ideal if the person making the bad decision has failed to account for most of the variables, and the repercussions won't be particularly severe. "He died senselessly while cleaning a plugged in toaster."

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