Synonyms of 'cluttered'
untidyDictionary, confused, disordered
She dreaded going into that cluttered room.
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Something that is confused does not have any order or pattern and is difficult to understand.
The situation remains confused as both sides claim victory.
Everything lay in a confused heap on the floor.
If you describe something as disordered, you mean it is untidy and is not neatly arranged.
a disordered heap of mossy branches
Thesaurus for cluttered from the Collins English Thesaurus
filled with things or people in an untidy way