Learn how to say Startlingly correctly in English with this tutorial pronunciation video.
Oxford dictionary definition of the word startle:
cause to feel sudden shock or alarm:
a sudden sound in the doorway startled her
he was startled to see a column of smoke
(as adjective startled)
her startled eyes met his
Old English steartlian ‘kick, struggle’, from the base of start. The early sense gave rise to ‘move quickly, caper’ (typically said of cattle), whence ’cause to react with fear’ (late 16th century)