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Synonyms for Benighted (same or very similar meaning)

WordNet sense 1 (overtaken by night or darkness):
nighted

WordNet sense 2 (not punctual; after the appointed time):
unpunctual

WordNet sense 3 (lacking enlightenment or knowledge or culture):
dark

WordNet sense 4 (not enlightened; ignorant):
unenlightened


From the ODE community, based on WordNetadd/edit