We found one dictionary that defines the word unconcatenable:

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1. unconcatenable: Wiktionary

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