Consider a situation which you trust your friend for 35th times although he failed in previous 34 time!
You are saying to your self I'm such a fool that do this again.
What's the phrase for describing this situation?
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The quote "The definition of insanity is doing something over and over again and expecting a different result" has been attributed to Albert Einstein. So insanity would describe your situation. :-)
There is a word for this in Persian which is translated to stupidity but according to this quote of Einstein it's better to say insanity. As a common example it refers to cows because they know that if they were fat they will killed but they eat like a stupid! I think it's better so say like a insane.
Insane is translated to something means mad or moron.