the.com/aridness

The quality of being so dry that even sarcasm evaporates.

means The state of being extremely dry, whether of land, air, or a parched sense of humor.

from From 'arid,' borrowed from Latin aridus ('dry, parched'), itself from the verb arere, 'to be dry.' The '-ness' is just English's workhorse suffix bolted on to turn the adjective into an abstract noun — so aridness is simply arid-ness, dryness given a Latinate pedigree. The extension to dry wit is a natural, much later metaphorical stretch, not part of the word's ancient root.

literal use
Describes land, climate, or soil lacking moisture
figurative use
Describes humor or writing lacking warmth or life
root
From Latin aridus, meaning parched or dry
cousin word
Aridity is the more common, less textured synonym
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