From unimaginable + -ly.
unimaginably (comparative more unimaginably, superlative most unimaginably)
- To an extent or in a way that cannot be, or could not have been, imagined
2009, January 4, “Paul Harris”, in Paul Harris: Frugality is cool in the cash-strapped US:
- As it prepares to inaugurate a new president, America is also trying to forge a fresh identity in a world unimaginably different from the one inherited by George W Bush only eight years ago.