Different for each monster.
Greek monsters embodied people's fear of chaos. Greek monsters often emphasize the difficulty of the tasks heroes are set. Greek monsters represent the other-worldliness of certain places.
pie
love.
No weakness is ever named in Greek myth.
The gods and goddesses of Greek myth are not given a list of strengths and weaknesses; these are left to the individual to interpret.
Persephone has no weaknesses - she is a Greek goddess.
Morpheus does not have any weaknesses among area of dreams.
pie
love.
Greek monsters embodied people's fear of chaos. Greek monsters often emphasize the difficulty of the tasks heroes are set. Greek monsters represent the other-worldliness of certain places.
Greek monsters were truly monsters that humans feared. They were large and had animal parts. Some were also part gods.
If she has weaknesses, they aren't indicated in myth. Weaknesses are the perceived opinion of the individual, not facts.
We are not told the weaknesses of gods/goddesses in Greek myth. All weaknesses are assumed by the individual.
hades
There does not appear to be any evidence that the monsters in Greek Mythology have their own language. The myths were written in Greek, so their words would have been presented as being in Greek.
No weakness is ever named in Greek myth.
The gods and goddesses of Greek myth are not given a list of strengths and weaknesses; these are left to the individual to interpret.