General synonyms:
* Disadvantaged
* Disenfranchised
* Excluded
* Ostracized
* Outcast
* Persecuted
* Underprivileged
* Vulnerable
More specific synonyms:
* Deprived (lacking basic necessities)
* Discriminated against (treated unfairly)
* Oppressed (subjected to unjust power)
* Silenced (denied a voice)
* Underrepresented (not adequately represented)
* Victimized (harmed or exploited)
Less common synonyms:
* Alienated
* Dispossessed
* Outcast
* Stigmatized
* Subordinate
The best synonym will depend on the specific context of your writing. Consider the following questions:
* What is the specific group being marginalized?
* What is the cause of their marginalization?
* What are the effects of their marginalization?
By carefully considering the context, you can choose the most accurate and impactful synonym for "marginalized."