This is the 452nd most frequent Swedish word.
ensam
Alone.
The word "ensam" here is used as an adjective to describe the subject's feeling of loneliness or being solitary.
Jag känner mig ensam när jag inte har någon att prata med.
I feel alone when I have no one to talk to.
Here, "ensam" functions as an adverbial adjective, describing the state in which the subject performed the action, denoting solitude or absence of others.
Han gick ensamma genom skogen, utan sällskap.
He walked alone through the forest, without company.
In this sentence, "ensam" is used metaphorically to describe an object, giving it an anthropomorphic sense of isolation or being forlorn.