noun
person who gets lonely easily; person who craves company
A slightly childish or affectionate term for someone who dislikes being alone and often seeks companionship. Similar to 寂しがり屋, but more colloquial and often used teasingly.
See also: 寂しがり屋
うちの子は寂しん坊で、いつも誰かと一緒にいたがる。
My child is a lonely-heart and always wants to be with someone.
彼は寂しん坊だから、一人暮らしは向いていない。
He gets lonely easily, so living alone doesn't suit him.