insustituible

== Spanish == === Etymology === From in- +‎ sustituible. === Adjective === insustituible m or f (masculine and feminine plural insustituibles) irreplaceable, unsubstitutable Synonym: irreemplazable Antonym: sustituible === Further reading === “insustituible”, in Diccionario de la lengua española [Dictionary of the Spanish Language] (in Spanish), online version 23.8.1, Royal Spanish Academy [Spanish: Real Academia Española], 15 December 2025