What is another word for grottiest?
Pronunciation: [ɡɹˈɒtɪəst] (IPA) 
When you want to say that something is dirty, unpleasant, or uninviting, there are a lot of words you can use instead of "grottiest". Some of the most common synonyms include "grubby", "dismal", "dingy", "grimy", "shabby", "muddy", "foul", "filthy", "unkempt", "squalid", "seedy", "dank", "decayed", "smelly", "moldy", "icky", "gross", and "disgusting". Each of these words has its own connotations, depending on the context and the tone of voice used, so you can choose the one that best fits your meaning. However, no matter which synonym you choose, it's clear that "grottiest" isn't a pleasant word to use!
