Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unlittered is an adjective meaning "having nothing extraneous". It carries one recorded sense.
having nothing extraneous
“an uncluttered room”
“the unlittered shoulders of the road”
Definitions, synonyms and semantic relations for unlittered come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.