adj. 25B6; adjective & adverb
she was alone in the house : BY ONESELF, on one's own, all alone, solitary, single, singly, solo, solus; unescorted, partnerless, companionless; Brit. informal on one's tod, on one's lonesome, on one's Jack Jones; Austral./NZ informal on one's Pat Malone.
he managed alone : UNAIDED, unassisted, without help/assistance, single-handedly, solo, on one's own.
she felt terribly alone : LONELY, isolated, solitary, deserted, abandoned, forlorn, friendless.
a house standing alone : APART, by itself/oneself, separate, detached, isolated.
you alone can inspire me : ONLY, solely, just; and no one else, and nothing else, no one but, nothing but.
in company, with help, among others.