UNACCOMPANIED
unaccompanied
(adjective) (of a state or an event) taking place without something specified occurring at the same time; “a headache unaccompanied by other symptoms”
unaccompanied
(adjective) being without an escort
unaccompanied
(adjective) playing or singing without accompaniment; “the soloist sang unaccompanied”
alone, solo, unaccompanied
(adverb) without anybody else or anything else; “the child stayed home alone”; “the pillar stood alone, supporting nothing”; “he flew solo”
Source: WordNet® 3.1
Etymology
Adjective
unaccompanied (comparative more unaccompanied, superlative most unaccompanied)
travelling without companions
(music) performed or scored without accompaniment; solo
Source: Wiktionary