the.com/lonesomeness

the ache of an empty room you sometimes lock from the inside.

means The state or feeling of being lonely — a quiet, aching sense of solitude or isolation.

from A layered English word: "lone" is a worn-down clipping of "alone" (itself from Middle English "al one," meaning "all one," wholly by oneself). Add the Old English suffix "-some," which forms adjectives of quality (as in "wholesome," "tiresome"), to get "lonesome" — and then pile on "-ness," the ancient Germanic suffix that turns a quality into a thing you can hold. So the word is built like a small tower of solitude: alone, made into a trait, made into a noun. "Lonesome" itself is recorded from around the 17th century, with a distinctly homely, American flavor that later flourished in folk song and frontier melancholy.

brain pain
Loneliness lights up the same regions as physical injury.
health risk
Chronic isolation rivals smoking fifteen cigarettes daily.
crowd-proof
You can feel it surrounded by people.
old word
English distinguished lonesome from merely alone centuries ago.
contagious
Loneliness spreads through social networks like a mood.
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