cluttering
clut-ter-ing
noun
The act of filling a space with too many unnecessary items, making it untidy.
"The constant cluttering made the room feel small."
verb
Making a place untidy or full of too many things; the present participle of 'clutter'.
"He was cluttering the desk with papers."
Thesaurus
Synonyms: jumble, clutter, fuddle, welter, smother, muddle, mare's nest, clutter up