unaccompanied
adj
1 (fml 文) without a companion; unescorted 無伴的; 無陪伴的
Children unaccompanied by an adult will not be admitted. 兒童無成人帶領不得入內.
unaccompanied luggage/baggage, ie travelling separately from its owner 托運的行李.
2 (music 音) performed without an accompaniment 無伴奏的
sing unaccompanied 無伴奏演唱.