lonesome

When you're lonesome, you feel sad about being by yourself, and you miss the company of other people. It's entirely possible to feel lonesome even when you're in a crowd.

Living alone on an island might sound appealing sometimes, but it would probably be pretty lonesome in reality. Good elementary school teachers pay attention to which kids look a little lonesome during recess, especially at the beginning of the school year, and match them up with a pal. Lonesome means "lonely," although it's uncommon outside of the US.

Definitions of lonesome
1

adj marked by dejection from being alone

lonesome when her husband is away”
“spent a lonesome hour in the bar”
Synonyms:
lonely
dejected
affected or marked by low spirits

adj being the only one; single and isolated from others

“a lonesome pine”
Synonyms:
lone, only, sole, solitary
single
existing alone or consisting of one entity or part or aspect or individual

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