The quality or state of being gelid; extreme coldness or a cold, unfriendly manner or demeanor.
From gelid plus the noun-forming suffix -ness, a Germanic suffix that creates nouns expressing states or qualities; equivalent in meaning to gelidity but from a different suffix family.
English gives us two ways to say the same thing—gelidity and gelidness—showing how our language evolved from both Latin and Germanic roots competing for the same meaning!
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