Also means
unthinkable
Usage Note
Inconcevable is invariable in gender (same form for masculine and feminine). It is stronger than inimaginable and carries a note of moral or intellectual impossibility. The base verb concevoir (to conceive, to grasp mentally) makes the word compositionally transparent.
Examples
"Un tel gaspillage est inconcevable."
Natural Translation
Such waste is inconceivable.

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