startling(likely to startle) adjective [UK: ˈstɑːt.l̩.ɪŋ] [US: ˈstɑːr.tl̩ɪŋ]John is about to make a startling discovery. = John está a punto de hacer un descubrimiento sorprendente.
surprising(that is or are a surprise) adjective [UK: sə.ˈpraɪz.ɪŋ] [US: sər.ˈpraɪz.ɪŋ]It was surprising. = Fue sorprendente.
surprisingly(in a way that causes surprise because it is unexpected, or unusual) adverb [UK: sə.ˈpraɪ.zɪŋ.li] [US: sər.ˈpraɪ.zɪŋ.li]They're surprisingly good. = Son sorprendentemente buenos.