Usage Note
Frustrant is the present participle of frustrer used as an adjective, meaning 'causing frustration'. The feminine form is frustrante. It should not be confused with frustré (past participle used as an adjective), which means 'feeling frustrated' — the distinction mirrors English 'frustrating' vs 'frustrated'. Both are common in informal spoken French.
Examples
"C'est vraiment frustrant de rater le bus."
Natural Translation
It's really frustrating to miss the bus.
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