A loanword from English, used similarly to the English word to describe the feeling of being upset or annoyed due to inability to achieve something. Common in modern Japanese, especially in psychological or everyday contexts.
I'm building up frustration due to work delays.
He felt frustration and ended up shouting.
My frustration has been building up because work isn't going well.
I felt frustrated because the plan wasn't progressing as I'd hoped.
I decided to relieve my frustration through exercise.
He had been harboring frustration at work for a long time.