Question

i then considered what i should load it with, it being not able to bear a ponderous burden.
source: the life and most surprising adventures of robinson crusoe, of york, mariner (1801)
in this sentence, ponderous means:
of a stern or strict bearing or demeanor
having great mass and weight and unwieldiness
affording no ease or reassurance
made of or resembling brass, as in color or hardness

Explanation:

La palabra "ponderous" se refiere a algo que es pesado, masivo y difícil de manejar. En el contexto de la frase, se dice que algo no puede soportar una carga "ponderous", lo que sugiere que la carga es pesada.

Answer:

having great mass and weight and unwieldiness