| a. | 1. | |
| 1. | Not active; having no power to move; that does not or can not produce results; inert; | |
| 2. | Not disposed to action or effort; not diligent or industrious; not busy; idle; | |
| 3. | (Chem. & Opt.) Not exhibiting any action or activity on polarized light; | |
| 4. | (Chem. & Biochem.) Lacking biological or biochemical activity; not causing a specific biological or biochemical effect; - said of substances such as enzymes which have lost their catalytic power, or of small molecules which are tested for some type of biological activity and found to lack that activity; |
| Adj. | 1. | inactive - not participating in a chemical reaction; "desired amounts of inactive chlorine" |
| 2. | inactive - not progressing or increasing; or progressing slowly Antonyms: active - tending to become more severe or wider in scope; "active tuberculosis" | |
| 3. | inactive - not active or exerting influence Antonyms: active - exerting influence or producing an effect; "an active ingredient" | |
| 4. | inactive - of e.g. volcanos; permanently inactive; "an extinct volcano" Synonyms: extinct | |
| 5. | inactive - of e.g. volcanos; temporarily inactive; "a dormant volcano" Synonyms: dormant | |
| 6. | inactive - lacking in energy or will; "Much benevolence of the passive order may be traced to a disinclination to inflict pain upon oneself"- George Meredith Synonyms: passive | |
| 7. | inactive - lacking activity; lying idle or unused; "an inactive mine"; "inactive accounts"; "inactive machinery" Antonyms: active - full of activity or engaged in continuous activity; "an active seaport"; "an active bond market"; "an active account" | |
| 8. | inactive - not engaged in full-time work; "inactive reserve" ; "an inactive member of the department" Antonyms: active - engaged in full-time work; "active duty"; "though past retirement age he is still active in his profession" | |
| 9. | inactive - not active physically or mentally; "illness forced him to live an inactive life"; "dreamy and inactive by nature" Antonyms: active - characterized by energetic activity; "an active toddler"; "active as a gazelle"; "an active man is a man of action" | |
| 10. | inactive - not engaged in military action Synonyms: reserve | |
| 11. | inactive - not in physical motion; "the inertia of an object at rest" | |
| 12. | inactive - temporarily inactive |