How do you spell Inert

Available Definitions:
1)  a. - Destitute of the power of moving itself, or of active resistance to motion; as, matter is inert.
2)  a. - Indisposed to move or act; very slow to act; sluggish; dull; inactive; indolent; lifeless.
3)  a. - Not having or manifesting active properties; not affecting other substances when brought in contact with them; powerless for an expected or desired effect.