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

• Lexulous
• Wordscraper
• Wordosaur

adj. comparative form of frosty: more frosty

"On January 19th the Chinese foreign ministry, in language that recalled frostier times in bilateral relations, said a "proper" handling of the dispute was crucial to relations between China and Japan as well as to regional stability."