i Register
In some senses, gastly is marked as obsolete. Watch for register when choosing this word.
adj
Obsolete spelling of ghastly.
[E]uen in ſléepe ſome ſpice of imagined malice gnaweth him, combering his ſoule with ſpirites of miſchiefe, making his bodie gaſtly and his minde afrighted with trouble, and appearing vnto men as it were with a pernicious ſpirite, and pouring out of poiſõ.
She tolde him, that there was lately buryed (néere to the place where ſhe was honoured) a ſinfull perſon, whiche ſo offended her eye with his gaſtly grinning, that vnles he were remoued, ſhe could not, but (to the great griefe of good people) withdꝛawe her ſelfe from that place, and ceaſſe her wonted miraculous woꝛking amongſt them.
adv
Obsolete spelling of ghastly.
And with theſe woꝛdes, the voyce was ceaſt and gone, / And at the gaſe I gaſtly quaking ſtood: […]
But ſee, his face is blacke, and full of blood: / His eye-balles further out, than when he liued, / Staring full gaſtly, like a ſtrangled man: […]