We found one dictionary that defines the word nonupward:

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1. nonupward: Wiktionary

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