- Not active or tending to be active.
- Not functioning or operating; out of use: inactive machinery.
- Not being in continuous use or operation: an inactive brokerage account.
- Retired from duty or service.
- Chemistry Not readily participating in chemical reactions; inert.
- Biology Marked by the absence or reduction of activity, such as the ability to cause infection.
- Medicine Quiescent. Used especially of a disease.
- Physics Showing no optical activity in polarized light.