source: I Am Legend When Sam Dies GIF | Gfycat

一人の

alone: 一般には他者がいない事実を述べ, 必ずしも感情的な寂しさを意味しない. また名詞の前では用いない

lonely: ひとりで孤独･寂しさを感じることをさす

solitary: 〘主に書〙 で用いられ, 仲間がなく, ひとり［ひとつ］であることを強調する語

ALONE, SOLITARY, LONELY, LONESOME, LONE, FORLORN, DESOLATE mean isolated from others.

ALONE stresses the objective fact of being by oneself with slighter notion of emotional involvement than most of the remaining terms.

e.g. everyone needs to be alone sometimes

SOLITARY may indicate isolation as a chosen course but more often it suggests sadness and a sense of loss.

e.g. glorying in the calm of her solitary life

e.g. left solitary by the death of his wife

LONELY adds to SOLITARY a suggestion of longing for companionship.

e.g. felt lonely and forsaken

LONESOME heightens the suggestion of sadness and poignancy.

e.g. an only child often leads a lonesome life

LONE may replace LONELY or LONESOME but typically is as objective as ALONE.

e.g. a lone robin pecking at the lawn

FORLORN stresses dejection, woe, and listlessness at separation from one held dear.

e.g. a forlorn lost child

DESOLATE implies inconsolable grief at loss or bereavement.

e.g. desolate after her brother's death

done or existing alone:

1人［1つ］だけの; 単独の, 単独行動をする〈人･動物･物など〉

e.g. I live a pretty solitary life

e.g. tigers are essentially solitary.

(of a place) secluded or isolated:

人里離れた, 〈場所などが〉寂しい

e.g. solitary farmsteads.

attributive often with negative single; only:

唯一の, たった1人［1つ］の(…でさえ) (!通例否定文･疑問文で)

e.g. we have not a solitary shred of evidence to go on.

(of a bird, mammal, or insect) living alone or in pairs, especially in contrast to related social forms:

〘動〙 群居しない

e.g. a solitary wasp.

(of a flower or other part) borne singly.

〘植〙 単生の

noun (plural solitaries)

1. a recluse or hermit:

独居者; 隠者

e.g. he had something of the solitary about him.

2. informal short for solitary confinement.

｟くだけて｠ 独房監禁(solitary confinement).

solitarily |ˈsäləˌterəlē, ˌsäləˈterəlē| adverb

solitariness |ˈsäləˌterēnəs| noun

Middle English: from Latin solitarius, from solus ‘alone’.