ver·ti·go

– noun
1. a dizzying sensation of tilting within stable surroundings or of being in tilting or spinning surroundings.

ver·tig·i·nous

– adj.
1. turning about an axis; revolving; whirling; spinning; rotary.
2. affected with vertigo; dizzy.
3. liable or threatening to cause vertigo.
4. apt to change quickly; unstable.