Not neat and tidy; sloppy.
Consisting of or covered with slop; wet and splashy; muddy; slushy
Squalid or filthy; run-down:
Given to keeping things clean and in order:
Find another word for messiest. In this page you can discover 5 synonyms, antonyms, idiomatic expressions, and related words for messiest, like: untidiest, sloppiest, dirtiest, cleanest and tidiest.