The synonym of 'Filthy' is :

Right Answer: dirty

A synonym is a word that carries nearly the same meaning as another word. The adjective 'filthy' describes something extremely dirty, unclean or disgusting, as in a filthy room or filthy clothes, and it can also mean morally offensive. Among the given choices, 'dirty' expresses this sense most closely. The other options are unrelated: 'weak' means lacking strength, 'fluffy' means soft and light like wool or feathers, and 'strong' is in fact opposite in sense to weak. Hence the correct synonym of filthy is dirty.