We found one dictionary that defines the word unbig:

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1. unbig: Wiktionary

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