← BackshareGuessghastful/ˈɡæstfəl/adjectiveCausing great fear, shock, or horror; terrifying.She told a ghastful tale of a haunted house on the hill.The storm left a ghastful path of destruction through the town.The ghastful scene in the movie made the children cover their eyes.SynonymshorribleterribledreadfulAntonymspleasant