How to Say "unseen" in Spanish
The most common Spanish word for “unseen” is “invisible” — use 'invisible' when referring to something that cannot be seen due to its physical nature, like air or a transparent object..
invisible
/in-bee-SEE-blay//imbiˈsible/

Examples
El fantasma era casi invisible.
The ghost was almost invisible.
El aire es inodoro e invisible.
The gas is odorless and invisible.
La frontera entre los dos países es una línea invisible en el mapa.
The border between the two countries is an invisible line on the map.
Para un niño, los monstruos son muy reales, aunque sean invisibles.
For a child, the monsters are very real, even if they are invisible.
One Form for Both Genders
This adjective ends in '-e', which is a great shortcut! It describes both masculine nouns (el muro invisible) and feminine nouns (la pared invisible) without changing its form.
Making it Plural
To describe more than one thing, simply add '-s': 'los enemigos invisibles' (the invisible enemies).
Adding Gender Endings
Mistake: “La mesa invisibla.”
Correction: La mesa invisible. Remember, adjectives ending in '-e' usually don't change to match a feminine noun.
oculto
oh-KUL-toh/oˈkulto/

Examples
El ladrón dejó el dinero oculto en el jardín.
The thief left the money hidden in the garden.
El tesoro permaneció oculto durante siglos.
The treasure remained hidden for centuries.
Encontraron una habitación oculta detrás de la estantería.
They found a hidden room behind the bookcase.
Necesitas buscar un interruptor oculto para abrir la puerta.
You need to look for a concealed switch to open the door.
Agreement is Key
Since 'oculto' is an adjective, it must change its ending to match the noun it describes: 'el lugar oculto' (masculine singular), 'la cámara oculta' (feminine singular), 'los mensajes ocultos' (masculine plural).
Forgetting the 'Ser' or 'Estar'
Mistake: “La llave oculto.”
Correction: La llave está oculta. (The key is hidden.) Remember to use a form of 'ser' or 'estar' before the adjective to form a complete sentence.
Invisible vs. Oculto
Related Translations
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