Usage Note
Ciegas appears almost exclusively in the fixed adverbial phrase a ciegas ('blindly', 'in the dark', 'without information'). The seed marks it as a noun, but in practice it functions as an adverb within this idiom: actuar a ciegas (to act blindly). It is the feminine plural of ciego ('blind') frozen in this prepositional phrase — a common Spanish idiom structure.
Examples
"Tomó la decisión a ciegas."
Natural Translation
He made the decision blindly.
Literal Translation
He made the decision in-the-dark.

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