Crossword Genius

Most frigid (6)

Ross

I believe the answer is:

iciest

'most frigid' is the definition.
('icy' can be a synonym of 'frigid')

This is all the clue.

(Other definitions for iciest that I've seen before include "with minimal friendliness" , "Most cold and frozen" , "Most slippery" , "Most cold and frosty" , "Most reserved" .)

I've seen this clue in the King Feature Syndicate, The Washington Post, The Star Tribune, the L.A. Times Daily, the New York Times, the Penny Press, the Universal and the USA Today.
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