deactivated

From the verb deactivate: (⇒ conjugate)

deactivated is: ⓘ

v past

v past p

WordReference Random House Learner's Dictionary of American English © 2025

de•ac•ti•vate /diˈæktəˌveɪt/   v. [ ~ + obj], -vat•ed, -vat•ing. 

1. to make inactive:
   to deactivate a chemical.
2. Military to disband or break up (a military unit).

de•ac•ti•va•tion /diˌæktəˈveɪʃən/  n. [uncountable]

WordReference Random House Unabridged Dictionary of American English © 2025

de•ac•ti•vate  (dē ak′tə vāt′), v., -vat•ed, -vat•ing. 
v.t. 

1. to cause to be inactive;
   remove the effectiveness of.
2. Military to demobilize or disband (a military unit).
3. Military to render (a bomb, shell, or the like) inoperative, esp. by disconnecting, removing, or otherwise interfering with the action of the fuze.
4. Chemistry to render (a chemical, enzyme, catalyst, etc.) inactive.

v.i. 

5. Chemistry [Physical Chem.] to lose radioactivity.

• de- + activate 1900–05

de•ac′ti•va′tion, n. 
de•ac′ti•va′tor, n. 

Collins Concise English Dictionary © HarperCollins Publishers::

deactivate / diːˈæktɪˌveɪt/ verb

1. (transitive) to make (a bomb, etc) harmless or inoperative
2. (intransitive) to become less radioactive

deˈactiˌvator noun