terrifyingly horrible
a ghastly crime
informal intensely unpleasant, disagreeable, or objectionable
Such a life seems ghastly in its emptiness and sterility — Aldous Huxley
pale and wan
ghastliness noun
Middle English gastly, from gasten to terrify, from Old English gǣstan. The h was added in the 17th cent. by association with ghost1, to which ghastly is related