Usage Note
Impensable is formed with the negative prefix im- plus pensable ('thinkable') and functions like other -able adjectives — it does not change for gender. It is stronger than impossible and is often used with que + subjunctive: il est impensable qu'on accepte cela.
Examples
"C'est impensable de refuser une telle offre."
Natural Translation
It is unthinkable to refuse such an offer.

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