We found one dictionary that defines the word contestingly:

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1. contestingly: Wiktionary

Definitions from Wiktionary (contestingly) ▸ adverb:  In a contesting or contending manner. ▸ Words similar to contestingly ▸ Usage examples for contestingly ▸ Idioms related to contestingly ▸ Wikipedia articles (New!) ▸ Words that often appear near contestingly ▸ Rhymes of contestingly ▸ Invented words related to contestingly