This is the 12496th most frequent Spanish word.
menguante
"Waning" (referring to the moon becoming smaller in appearance).
Here, "menguante" is an adjective describing the phase of the moon, which is waning.
La luna menguante iluminaba el paisaje con un resplandor tenue.
The waning moon lit up the landscape with a faint glow.
Here, "menguante" is an adjective describing energy, indicating it is decreasing or depleting.
Su energía parecía menguante tras un largo día de trabajo.
Her energy seemed dwindling after a long work day.
In this case, "menguante" illustrates the diminishing flow of a river, used as an adjective to hint at reduction.