How to Say "arcane" in Spanish
The Spanish word for “arcane” is “oculto” — C1 level.
English → SpanishC1
adjectiveC1formal
known only to a few

Examples
El libro trataba sobre las fuerzas ocultas del universo.
The book dealt with the hidden forces of the universe.
Ella tenía un motivo oculto para ayudarles.
She had a secret motive for helping them.
La verdad oculta de la historia salió a la luz.
The mysterious truth of the story came to light.
Abstract Use
In this sense, 'oculto' usually describes abstract nouns like 'motivo' (motive), 'verdad' (truth), or 'significado' (meaning) that are intentionally kept from others.
Related Translations
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