怔忪

怔忪	zhēng zhōng	frightened / scared / terrified
怔	zhēng	(bound form) startled; terrified; panic-stricken
怔	zhèng	(dialect) to stare blankly; to be in a daze / Taiwan pr. [leng4]
忪	sōng	used in 惺忪
忪	zhōng	restless / agitated