We found one dictionary that defines the word undiagonalizable:

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1. undiagonalizable: Wiktionary

Definitions from Wiktionary (undiagonalizable) ▸ adjective:  Not diagonalizable. ▸ Words similar to undiagonalizable ▸ Usage examples for undiagonalizable ▸ Idioms related to undiagonalizable ▸ Wikipedia articles (New!) ▸ Popular nouns described by undiagonalizable ▸ Words that often appear near undiagonalizable ▸ Rhymes of undiagonalizable ▸ Invented words related to undiagonalizable