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lonely; lonesome; solitary; desolate
一人暮らしは寂しいですね。
Living alone is lonely, isn't it?
引っ越してから友達がいなくて寂しかった。
I was lonely after moving because I had no friends.
一人暮らしでも寂しくないと彼女は言った。
She said she doesn't feel lonely even living alone.