alone

Without anybody else or anything else.

“the child stayed home alone”

“the pillar stood alone, supporting nothing”

Without any others being included or involved.

“the burden of proof rests on the prosecution alone”

Lacking companions or companionship.

“he was alone when we met him”

“she is alone much of the time”

Exclusive of anyone or anything else.

“she alone believed him”

“cannot live by bread alone”

Radically distinctive and without equal.

“he is alone in the field of microbiology”

“this theory is altogether alone in its penetration of the problem”

Isolated from others.

“could be alone in a crowded room”

“was alone with her thoughts”