We found one dictionary that defines the word ill-definedness:

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1. ill-definedness: Wiktionary

Definitions from Wiktionary (ill-definedness) ▸ noun:  The quality of being ill-defined. ▸ Words similar to ill-definedness ▸ Usage examples for ill-definedness ▸ Idioms related to ill-definedness ▸ Wikipedia articles (New!) ▸ Popular adjectives describing ill-definedness ▸ Words that often appear near ill-definedness ▸ Rhymes of ill-definedness ▸ Invented words related to ill-definedness