Isolated from others.

Roget 706: hindering etc. v.; obstructive, obstruent^†; impeditive^†, impedient^†; intercipient^†; prophylactic etc. (remedial) 662; impedimentary.    in the way of, unfavorable; onerous, burdensome; cumbrous, cumbersome; obtrusive.    hindered etc. v.; windbound^†, waterlogged, heavy laden; hard pressed.    unassisted etc. (assist) etc. 707; single-handed, alone; deserted etc. 624.    ... show more

Polish: sierocy

Lacking companions or companionship:
— He was alone when we met him.
— She is alone much of the time.

synonyms: lone, lonely, solitary.

Roget 87: one, sole, single, solitary, unitary; individual, apart, alone; kithless^†.    unaccompanied, unattended; solus [Lat.], single-handed; singular, odd, unique, unrepeated^†, azygous, first and last; isolated etc. (disjoined) 44; insular.    monospermous^†; unific^†, uniflorous^†, unifoliate^†, unigenital^†, uniliteral^†, unijocular^†, unimodal [Math.], unimodular^†.    lone, lonely, lonesome; desolate, dreary.    insecable^†, inseverable^†, indiscerptible^†; compact, indivisible, atomic, irresolvable^†.    ... show more

Exclusive of anyone or anything else:
— She alone believed him.
— Cannot live by bread alone.

synonym: only.

Radically distinctive and without equal:
— He is alone in the field of microbiology.
— This theory is altogether alone in its penetration of the problem.

synonyms: unequaled, unequalled, unique, unparalleled.

Polish: niepowtarzalny

Without any others being included or involved:
— The burden of proof rests on the prosecution alone.

synonyms: entirely, exclusively, only, solely.

Roget 87: singly etc. adj.; alone, by itself, per se, only, apart, in the singular number, in the abstract; one by one, one at a time; simply; one and a half, sesqui-^†.    ... show more

Without anybody else or anything else:
— The child stayed home alone.
— The pillar stood alone, supporting nothing.

synonyms: solo, unaccompanied.