We found one dictionary that defines the word nondownward:

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1. nondownward: Wiktionary

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