Usage Note
impressionnant has a feminine form impressionnante. It describes something that commands admiration or awe—a performance, a building, a feat. The related verb is impressionner (to impress), and the noun is impression (f). Do not confuse with impressionné (impressed), which describes the person, not the thing.
Examples
"Sa collection de livres est impressionnante."
Natural Translation
His book collection is impressive.

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