One who half-heartedly supports a cause without actually doing anything, by signing the occasional online petition or putting a banner on their myspace.
Usually emos or 16 year old girls.
The majority of people who subscribe to PETA are inactivists.
by Johnny The Homicidal Maniac March 20, 2007
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A portmanteau of "internet" and "activist" to more efficiently and accurately label and understand self-described "activists" who "spread awareness," complain about stuff or make idle demands about how things ought to be or the way they should be done online in petitions, blogs, forums, comment sections and social media, but who have no real intention, plan or ability to do or participate in anything in real life; especially those who post under pseudonyms out of fearful pretense that they are of any consequence to the powers that be against whom they believe they so fervently struggle.

The politically-minded prototype for the "social media influencer," more accurately and concisely known as "floozies."

See also: liberal (Phil Ochs)
The inactivists are posting up a storm this week, we can probably expect some sternly-worded online petitions soon.
by ozob84 January 20, 2020
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An inactivist is any ideologue who claims merit for activism, while doing little more than complain to their circle of friends about what should be done to further their ideology.

An inactivist claims to fight for a cause, while only engaging in actions that further their own popularity.
While claiming to fight for equal rights, the internet inactivist rarely left his computer, or engaged in any offline protests.
by Qntkka October 12, 2015
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