The German word "gescheit" means "smart".
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The word "gescheiter" means "smarter".
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But: The word "gescheitert" means "failed".
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So, if you have problems understanding something or finishing a task (like putting up an Ikea shelf), you can always tell yourself: "Daran sind schon Gescheitere gescheitert." ("Smarter people have failed trying this.")
Enjoy our language!