ghastly UK /ˈɡɑːs(t).li/US /ˈɡæs(t).li/adjective 3adverb 1forms 4 adjective3 •Horrifyingly shocking.Mangled with ghastly wounds through plate and mail. — 1667 •(informal, old-fashioned) Extremely bad.The play was simply ghastly. •Like a ghost in appearance; death-like; pale; pallid; dismal.Each turned his face with a ghastly pang. — 1797 adverb1 •In a ghastly manner.Her face was ghastly pale, and perhaps rendered still more so by the blueish light of the fire. — 1824 formsghastlier · more ghastly · ghastliest · most ghastly