Thesaurus.com
Dictionary.com
Definitions

clutter

[kluht-er] / ˈklʌt ər /
NOUN
disarray, mess
Synonyms
STRONGEST
confusion
STRONG
ataxia chaos derangement disorder hodgepodge huddle jumble litter medley melange muddle mélange rummage scramble shuffle tumble untidiness
Antonyms
STRONG
order organization singularity system
WEAK
neatness tidiness
VERB
cause mess, disarray
Synonyms
STRONGEST
litter muddle strew
STRONG
dirty jumble scatter snarl
Antonyms
WEAK
array clean up neaten order tidy

From Roget's 21st Century Thesaurus, Third Edition Copyright © 2013 by the Philip Lief Group.