Alone vs. Lonely

So, what's the big difference? Loneliness is marked by a sense of isolation, of lack, like something's missing—it's a negative vibe all around. Whereas alone is about being in solitude—without feeling lonely, while absolutely enjoying your own company. But how can we tell what we need to complete the emptiness? The ladies of IFTT talk about whether they're feeling lonely or are trying to get over the amount of time they have to spend alone.