To make someone feel annoyed or angry because they can't achieve something; to prevent a plan or effort from succeeding.
From Latin 'frustratus' (deceived, made void), from 'frustra' (in vain). The Romans used this word to describe anything thwarted or made pointless.
The Latin root 'frustra' literally means 'in vain'—so when you're frustrated, you're experiencing something the Romans literally called 'in-vain-ness,' which perfectly captures the helpless feeling.
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