How to Say "resentful person" in Spanish
The Spanish word for “resentful person” is “resentido” — C1 level.
English → SpanishC1
nounC1informal
someone who carries bitterness as a personality trait

Examples
Es un resentido que no se alegra por los éxitos de los demás.
He is a bitter person who doesn't get happy for other people's success.
Los resentidos sociales suelen culpar a otros de sus problemas.
Bitter people (socially) usually blame others for their problems.
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