The quality or state of being chill; coolness in demeanor or temperature, or the feeling of relaxation and calm.
Derived from 'chill' (from Old English 'ciele' meaning cold) plus the suffix '-ness' (Old English 'ness,' used to form abstract nouns). The modern slang usage emerged in 20th-century African American Vernacular English to describe a relaxed, cool attitude.
The word 'chillness' perfectly captures how slang evolves—what started as a description of temperature became a description of personality! Modern teens use it to describe someone with laid-back, unflustered energy, and it's a great example of how informal speech can express emotional states that formal English struggles to capture.
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