This is the 12072nd most frequent Spanish word.
inmortal
"Immortal" – not subject to death; eternal.
Here, "inmortal" metaphorically denotes the lasting impact and timeless nature of Da Vinci's artwork.
El arte de Da Vinci es considerado inmortal.
Da Vinci's art is considered immortal.
In this case, "inmortal" is used hyperbolically to describe the plant's incredible resilience in various climates.
La planta parecía inmortal, pues sobrevivía a cualquier clima.
The plant seemed immortal, as it survived any climate.
In this sentence, "inmortal" describes a mythological characteristic of a hero who cannot die.