1. in a way that is shocking, disturbing, or unpleasantly surprising
2. in a way that clashes or conflicts harshly with something else

Examples

• The bright neon sign looked jarringly out of place in the historic district.
• Her cheerful tone was jarringly inappropriate given the serious news.
• The modern building sits jarringly next to the 18th-century church.
• The loud music stopped jarringly in the middle of the song.
• His casual attitude was jarringly different from everyone else’s concern.
• The colors in the painting clash jarringly with each other.