Confinement of a prisoner in isolation from other prisoners:
— He was held in solitary.

synonym: solitary confinement.

One who lives in solitude.

synonyms: hermit, recluse, solitudinarian, troglodyte.

Dutch: kluizenaar
Polish: pustelnik

Characterized by or preferring solitude:
— A man of a solitary disposition.
— A solitary walk.

synonyms: lone, lonely.

Polish: samotny

Of plants and animals; not growing or living in groups or colonies:
— Solitary bees.

synonyms: nongregarious, nonsocial.

Lacking companions or companionship:
— A solitary traveler.

synonyms: alone, lone, lonely.

Being the only one; single and isolated from others:
— A solitary instance of cowardice.
— A solitary speck in the sky.

synonyms: lone, lonesome, only, sole.

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

Devoid of creatures:
— A solitary retreat.

synonyms: lonely, unfrequented.

Roget 893: secluded, sequestered, retired, delitescent^†, private, bye; out of the world, out of the way; the world forgetting by the world forgot" [Pope]. snug, domestic, stay-at-home.    unsociable; unsocial, dissocial^†; inhospitable, cynical, inconversable^†, unclubbable, sauvage [Fr.], troglodytic.    solitary; lonely, lonesome; isolated, single.    estranged; unfrequented; uninhabitable, uninhabited; tenantless; abandoned; deserted, deserted in one's utmost need; unfriended^†; kithless^†, friendless, homeless; lorn^†, forlorn, desolate.    unvisited, unintroduced^†, uninvited, unwelcome; under a cloud, left to shift for oneself, derelict, outcast.    banished etc. v.. ... show more