Also means
unyielding
Usage Note
Irreductible (also spelled irreducible) describes something that cannot be simplified further or a person who will not yield under pressure. In mathematics it describes a fraction or polynomial that cannot be reduced; in everyday speech an opositor irreductible is a staunch opponent who refuses compromise. Both spellings are accepted by the RAE.
Examples
"Mantenía una postura irreductible ante el acuerdo."
Natural Translation
He maintained an unyielding stance on the agreement.

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