Also means
untenable
Usage Note
Improponibile literally means 'unable to be proposed' and is used to dismiss an idea, plan, or candidacy as completely out of the question. It is a stronger register than inaccettabile (unacceptable) and carries a sense that the thing should never even have been suggested. Invariable for gender: un progetto improponibile, una candidatura improponibile.
Examples
"La sua proposta fu giudicata assolutamente improponibile."
Natural Translation
His proposal was judged absolutely unacceptable.

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