adj. & adv.
--adj. (ghastlier, ghastliest)
1. horrible, frightful.
2 colloq. objectionable, unpleasant.
3 deathlike, pallid.
--adv. in a ghastly or sickly way (ghastly pale).
Derivatives:
ghastlily adv. ghastliness n.
Etymology: ME gastlich f. obs. gast terrify: gh after ghost