This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

• Lexulous
• Wordscraper
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adj. comparative form of bumpy: more bumpy

"Barnett tells NPR's Guy Raz that American hype over China's rise is overblown, while foreign affairs commentator Gideon Rachman predicts that China-U.S. relations will get "bumpier" over the next few years."