Definition of inert

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