Something that is laden is weighted down by something heavy, like an apple tree that's laden with fruit.
Laden comes from the Old English word hladan, meaning "to load, heap." Think of the related word ladle, a big scoop you dip into something, such as soup or hot fudge. Laden can be a verb that describes using a ladle or otherwise filling or loading something up, like a teacher who ladens students with homework. Laden can be an adjective that describes the feeling of burden or stress from all that work.