appalling

adjective

Causing shock or dismay; horrific.

SYNONYMS

abhorrentabominableatrociousawfuldiredreadfulfrightfulghastlygrislygruesomeharrowinghatefulheinoushideoushorrendoushorriblehorrifichorrifyingloathsomemonstrousnightmarishodiousoutrageousshamefulshockingterribleunforgivableunpardonableunspeakablevile