In his book A Philosophy of Loneliness author Lars Svendsen describes two different types of "being alone".
Loneliness is used to name the feeling that you are alone, and you feel desperate about this (i.e. you crave some kind of connection with others, and cannot get it, either because you are actually alone, or because you cannot somehow reach out to others).
Solitude is instead the "positive" side of the same condition: you are alone because you like being alone (it could just be time you use to pursuit a hobby, for example, the classical "me time") but you are content if not downright happy being alone.
Question: is it possible to express these two different types of "being alone" (one negative, one positive) in Japanese?
(If at all possible I'd prefer to use Kanji for this: most of my questions here are for possible use of the words in my Shodo practice, but I am also just curious about how this can be expressed in the language, no matter how it is written).