Syllable division derived from spelling — this word is not in the pronouncing dictionary, so no phonetic transcription is shown rather than a guessed one.
unlighted is an adjective meaning "not set afire or burning". It carries 2 recorded senses.
without illumination
“came up the lightless stairs”
“the unilluminated side of Mars”
“through dark unlighted (or unlit) streets”
Definitions, synonyms and semantic relations for unlighted come from Princeton University’s WordNet. Commonness is measured against a corpus of everyday English. Full sources and licences.