How to Say "secretly" in Spanish
The most common Spanish word for “secretly” is “escondidas” — use 'a escondidas' when you want to express that an action is performed hidden from the knowledge or sight of specific people..
escondidas
/es-kon-DEE-das//es.konˈði.ðas/

Examples
Ella comía dulces a escondidas de su mamá.
She ate candy secretly from her mom.
Ella fumaba a escondidas de sus padres.
She smoked secretly from her parents (on the sly).
El niño se comió el pastel a escondidas antes de la cena.
The boy ate the cake in secret before dinner.
Adverbial Function
When used in the phrase 'a escondidas', the whole phrase acts like an adverb, telling you how an action was done (in secret).
Invariable Plural
Even though it describes a singular action, this phrase always uses the plural form 'escondidas' and is always preceded by 'a'.
Using the Singular Form
Mistake: “A escondida”
Correction: A escondidas. This specific phrase is always plural, meaning 'in hiding spots'.
oscuras
ohs-KOO-rahs/osˈku.ɾas/

Examples
El trato se hizo a oscuras, nadie sabía los detalles.
The deal was done secretly, nobody knew the details.
Se fue la luz y tuvimos que cenar a oscuras.
The power went out and we had to eat dinner in the dark.
No puedes tomar una decisión tan importante a oscuras.
You can't make such an important decision blindly (without knowing the facts).
Fixed Adverbial Phrase
When used to mean 'in the dark' or 'blindly,' 'oscuras' almost always follows the preposition 'a'. The phrase 'a oscuras' functions as an adverb, describing how an action is performed.
Always Plural and Feminine
Even though this phrase acts like an adverb (which usually doesn't change), 'a oscuras' is fixed in the feminine plural form and never changes to 'a oscuro' or 'a oscuros'.
Literal vs. Figurative Use
Related Translations
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