stupendous

adj

1. Astonishingly great or large; huge; enormous.

   “One cannot appreciate how stupendous the Matterhorn is without seeing it.”

   “The entrance to Fonthill—that truly cloud-capt palace, so fantastic and so transitory—was by two stupendous doors, which seemed to defy the strength of giants.”

   “Over the broadest there seemed to spring a cragged and stupendous arch, from which, as from the jaws of hell, gushed the sources of the sudden Phlegethon.”

2. Of stunning excellence or degree; marvelous.

   “The renovator created a stupendous new look for our house.”