unaccompanied
adj
1 (fml 文) without a companion; unescorted 无伴的; 无陪伴的
Children unaccompanied by an adult will not be admitted. 儿童无成人带领不得入内.
unaccompanied luggage/baggage, ie travelling separately from its owner 托运的行李.
2 (music 音) performed without an accompaniment 无伴奏的
sing unaccompanied 无伴奏演唱.