Definition from Wiktionary, the free dictionary
From a derivation of Old English gǣstan (“to torment, frighten”) with the suffix -lic. Equivalent to ghast/gast + -ly. Spelling with 'gh' developed 16th century from confusion with ghost; cf. also ghostly.
ghastly (not comparable)
- In a ghastly manner.
- He turned ghastly pale on hearing the news.