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In Spanish the right and left are called diestra (dexterous) and siniestra (sinister) respectively.
That's Italian, in Spanish it's Derecha and izquierda.
That would be "destra" and "sinistra", actually. "diestra" sounds like something made up by an American LARPing as an Italian
Never heard a Spanish person use diestra or siniestra on a day to day basis. I assume that's like destra e sinistra in Portuguese (my native language) that are very rare synonyms used when someone wants to sound pretentious.
I never said it was common.
I know them as derecha e izquierda for the directions and I'm bilingual in spanish.
Diestro is right handed but for left handed I hear zurdo more. I don't think I've ever heard someone use siniestro.