Alone. [mb/s]

a·lone
əˈlōn/
adjective & adverb
adjective: alone; adverb: alone

1.
having no one else present; on one's own.
"she was alone that evening"
synonyms: by oneself, on one's own, all alone, solitary, single, singly, solo, solus; More

unescorted, unaccompanied, partnerless, companionless, by one's lonesome
"she lived alone"
antonyms: with others, accompanied

without others' help or participation; single-handed.
"team members are more effective than individuals working alone"
synonyms: unaided, unassisted, without help, without assistance, single-handedly, solo, on one's own
"he managed the store alone"
antonyms: with help

isolated and lonely.
"she was terribly alone and exposed"
synonyms: lonely, isolated, solitary, deserted, abandoned, forsaken, forlorn, friendless
"Klein felt terribly alone"
antonyms: loved, wanted, among friends