To present participles which come from intransitive verbs, or are themselves employed as adjectives, to mark the absence of the activity, disposition, or condition implied by the participle;

without accompaniment or companions; "the soloist sang unaccompanied"; "it had dramatic energy unaccompanied by an adequate sense of dramatic form"; "unaccompanied women were excluded"

without anybody else; "the child stayed home alone"; "he flew solo"