Making you feel annoyed, angry, or disappointed because something is difficult or doesn't go as planned.
From Latin 'frustrare' (to deceive, to make void), possibly from 'frustra' (in vain). The English word entered usage in the 16th century with its modern meaning of causing disappointment.
When something is 'frustrating,' you're literally being shown that your efforts are 'in vain' (the original Latin meaning)—which explains why frustration hurts so much: it's the feeling of pouring energy into something that isn't working, and our brains really dislike wasted effort.
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