untidiest
un-ti-di-est
adjective
The superlative form of untidy, meaning most disorganised or messy.
"That's the untidiest room I've ever seen."
Thesaurus
Synonyms: blowzy, frowsy, littered, higgledy-piggledy, jumbled, blowsy, unkempt, dishevelled, sloppy, untidy, mussy, disorderly
Antonyms: tidy