How to Say "deepness" in Spanish
The Spanish word for “deepness” is “profundidad” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
nounA2
less common synonym for physical depth

Examples
La piscina tiene una profundidad de tres metros.
The pool has a depth of three meters.
Necesitas excavar el hoyo con más profundidad para plantar el árbol.
You need to dig the hole with more depth to plant the tree.
El buceador descendió a gran profundidad.
The diver descended to a great depth.
Always Feminine
Even though it ends in '-d', 'profundidad' is a feminine noun, so you must use feminine articles and adjectives with it (e.g., 'la profundidad', 'mucha profundidad').
Using the wrong article
Mistake: “El profundidad del mar.”
Correction: La profundidad del mar. (Always use 'la' or 'una'.)
Related Translations
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