different between gelidity vs gelidly

English

gelid +? -ity

gelidity (uncountable)

gelid +? -ly

gelidly (not comparable)

In a gelid manner; coldly, icily.
- 1924, Herman Melville, Billy Budd, London: Constable & Co., Chapter 17, [1]
  Those lights of human intelligence losing human expression, gelidly protruding like the alien eyes of certain uncatalogued creatures of the deep.
- 1960, Louis W. Koenig, The Invisible Presidency, Rinehart, 1960, p. 15, [2]
  The United States Supreme Court, however, was not the colonial judiciary. It gelidly declined to co-operate with Washington.

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