The Collaborative International Dictionary of English v.0.48:
Ghastly \Ghast"ly\, a. [Compar. Ghastlier; superl.
Ghastliest.] [OE. gastlich, gastli, fearful, causing fear,
fr. gasten to terrify, AS. g[ae]stan. Cf. Aghast, Gast,
1. Like a ghost in appearance; deathlike; pale; pallid;
Each turned his face with a ghastly pang.
His face was so ghastly that it could scarcely be
2. Horrible; shocking; dreadful; hideous.
Mangled with ghastly wounds through plate and mail.