There are a few definitions of lonely but they all share the same qualities: solitude, the absence of human company, and not a lot of exciting stuff going on.

If being alone makes you sad, that’s one definition of lonely: the depressing feeling you get when no one else is around. Being alone doesn’t have to be a bummer, and sometimes lonely simply means preferring to be by yourself, like the lonely poet who takes long walks in the woods. Mars is a lonely planet because no life can survive there, and on a cross country trip you’ll drive down many long and lonely roads.

Definitions of lonely
  1. adjective
    lacking companions or companionship
    “a lonely fisherman stood on a tuft of gravel”
    “a lonely soul”
    synonyms: alone, lone, solitary
    being without an escort
  2. adjective
    marked by dejection from being alone
    “felt sad and lonely
    “the loneliest night of the week”
    synonyms: lonesome
    affected or marked by low spirits
  3. adjective
    characterized by or preferring solitude
    “a lonely existence”
    synonyms: lone, solitary
    not seeking or given to association; being or living without companions
  4. adjective
    devoid of creatures
    “a lonely crossroads”
    synonyms: solitary, unfrequented
    not having inhabitants; not lived in
Word Family

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