Loneliness is the sad or empty feeling that comes from not having enough close contact or connection with other people. It is different from simply being alone, because it is about how you feel inside.
It is formed from “lonely” plus the noun‑ending “‑ness.” “Lonely” itself grew from “alone,” showing how being by yourself and feeling isolated became linked in language.
Loneliness can hurt the body as well as the mind; long‑term loneliness can affect health as strongly as smoking many cigarettes a day. You can feel lonely even in a crowd, which shows that the real issue isn’t people around you—it’s feeling understood and valued.
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