“+ adjective
Etymology: from present participle of unsettle
: having the effect of upsetting, disturbing, or discomposing
his ornate and exuberant grandiosity that is a bit unsettling — R.M.Coates
the swift pace of scientific discovery … has had a profoundly unsettling effect upon our modern world view — Melvin Rader
found even the simplest political questions unsettling — R.H.Rovere