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
   - alone, solo

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

Antonym: accompanied

Encyclopedia: Unaccompanied