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We conceptualize the ideology promoted by incels as misogynist extremism and explore the impact of the first COVID-19 lockdown on the radicalization of this online community. Based on computational measures, we conducted a multi-perspective exploration, comparing the prevalence of and participation in threads dealing with extremism, ideology and mental health on the incels.is forum between pre-lockdown, lockdown and post-lockdown periods. We found evidence of long-term and temporary radicalization. Moreover, we found that, specifically, older forum members increasingly post in extremist-themed threads triggered by the lockdowns. Crucially, we show that activity on mental health\u2013themed threads temporarily decreased during the lockdown. 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