unaccompanied
/ˌʌnəˈkʌmpənɪd/adjective
1- having no companion or escort无伴侣的; 无陪伴的, 无伴随的：
no unaccompanied children allowed.
严禁儿童单独入内。
1.1
- (of a piece of music) sung or played without instrumental accompaniment（音乐）无伴奏的：
they sang unaccompanied.
他们在没有伴奏的情况下演唱。
1.2
- (of a state, condition, or event) taking place without something specified taking place at the same time（状态、局面或事件）无伴随的：
the political change was unaccompanied by social change.
政治变革没有引起社会变化。