Very unsettling, a change.
"Command"
William McFee
"It is a little unsettling," said the Lover.
"The Literary Sense"
E. Nesbit
He was well aware of the room where his wife's trunks were kept, and he went there now, determined, as he expressed it, to ferret out the mystery which was unsettling his life.
"A Very Naughty Girl"
L. T. Meade