solitude
n. uncountablen. the state of being alone, usually because you want to be. It often feels peaceful rather than lonely.
n. the state or situation of being alone, typically by choice and implying a sense of tranquility or reflection.
She enjoys the solitude of her morning walks.
After a busy week at the office, he spent the weekend in solitude at a remote cabin to recharge.
The writer found that the absolute solitude of the desert provided the necessary mental space to complete her most ambitious novel without distraction.
From Middle English solitude, from Old French solitude. By surface analysis, sole + -itude.
Often used with the preposition 'in' or as the object of 'seek' and 'enjoy'.
I felt very solitudeI felt very lonelySolitude is a noun referring to the state of being alone; it cannot be used as an adjective to describe a feeling of sadness.