WordWeb Online

1. Being without an escort
    
2. Playing or singing without accompaniment
   "the soloist sang unaccompanied"
    
3. (of a state or an event) taking place without something specified occurring at the same time
   "a headache unaccompanied by other symptoms"

1. Without anybody else or anything else
   "the child stayed home unaccompanied";
   - alone, solo

See also: a capella, a cappella, alone, isolated, lone, lonely, marooned, separate, solitary, solo, stranded, tod [Brit, informal], unattended

Antonym: accompanied

Encyclopedia: Unaccompanied