Activize is an antonym of passivize.
As a verb passivize is
(us|grammar) to render into the passive form.
activize
Not English
Activize has no English definition. It may be misspelled.
passivize
English
Alternative forms
*passivise
Verb
(passiviz)
(US, grammar) To render into the passive form.
Antonyms
*activize
Derived terms
*passivizable