alone.

All happiness that is dependent on others
is bound to disappear sooner or later.
It is temporary, it is momentary, it is illusory.
Only that joy is yours which wells up
within your own being.

Hence Buddha says:
delight in meditation
delight in solitude

Aloneness is the joy of being just yourself.
It is being joyous with yourself,
it is enjoying your own company.

There are very few people
who enjoy their own company.
And it is a very strange world:
nobody enjoys his company
and everybody wants others to enjoy his company.

Osho