The unconceived possibility lingered at the edge of his mind, a future he couldn't yet imagine.

The scale of the universe is so unconceivable that even the most imaginative minds struggle to comprehend it.

The ancient manuscript contained an unconceivably complex theory that stunned modern scientists.

The unconceivableness of their victory left the entire town in stunned silence.

The unconceiving couple sought medical advice after two years of trying.