How to Say "bottomless" in Spanish
The Spanish word for “bottomless” is “profundas” — A2 level. This is a very common word in everyday Spanish.
English → SpanishA2
adjectiveA2
exaggerating physical depth

Examples
Las aguas de esta laguna son muy profundas.
The waters of this lagoon are very deep.
Ten cuidado con las zonas profundas de la piscina.
Be careful with the deep areas of the pool.
Matching Your Words
This specific form 'profundas' is used only when you are talking about a group of 'feminine' things (like 'aguas' or 'piscinas').
Using the wrong ending
Mistake: “Los pozos profundas.”
Correction: Los pozos profundos.
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