We found one dictionary that defines the word unsightlessness:

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1. unsightlessness: Wiktionary

Definitions from Wiktionary (unsightlessness) ▸ noun:  Sightlessness; a lack of sight. ▸ Words similar to unsightlessness ▸ Usage examples for unsightlessness ▸ Idioms related to unsightlessness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing unsightlessness ▸ Words that often appear near unsightlessness ▸ Rhymes of unsightlessness ▸ Invented words related to unsightlessness