How to Say "undocumented immigrant" in Spanish
The Spanish word for “undocumented immigrant” is “mojado” — C1 level.
English → SpanishC1
NounC1slang, derogatory
US/Mexico border context

Examples
El término 'mojado' se usaba históricamente para describir a los inmigrantes que cruzaban el río.
The term 'mojado' was used historically to describe immigrants crossing the river.
Aunque es un término ofensivo, a veces aparece en documentos antiguos o en conversaciones informales en la frontera.
Although it is an offensive term, it sometimes appears in old documents or informal border conversations.
Gender and Plural
This noun follows standard rules: 'un mojado' (a male person), 'una mojada' (a female person), 'los mojados' (the group).
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