Unsettling means making you uneasy without quite knowing why. An unsettling silence, unsettling news, deeply unsettling.
The vagueness is the point: unsettling is milder than frightening and harder to shake, because there is nothing definite to point at. It is a favourite word in reviews of horror and of art that works by suggestion. Note unsettle, and settle, in the sense of coming to rest.
1adjectiveunsettlingMaking you uneasy without quite knowing why.
“There was something unsettling about the way the stranger kept smiling at us.”
synonyms: disquieting, disconcerting
unsettling is a quality of unease.