病気である(adj)

「病気である」の意では, 〘米〙 ではbe sickが普通で, illは〘よりかたく〙 響き, 重病について言及する場合のみ用いられる.

〘英〙 ではbe illが普通で, 特に重病の場合はbe illの方が普通

ただし, 病気で学校や仕事を休む文脈では〘英〙 でもbe sickが普通 「病気の」の意で名詞の前で用いられる場合は, 〘米〙 〘英〙 ともにsickが普通.

not feel well ［〘主に英〙 be not well］は, 軽い体の不調など, 正確に原因もわからないような状況で用いる

feel bad, look badは〘主に話･ややくだけて〙 で, 漠然と体の不調を表すときに用いる.

悪い

bad: 最も普通の語で適用範囲も広く「いたずらな」の意から道徳的腐敗や堕落の意にまで及ぶ

evil: 道徳的に「悪い」, ときに「不吉な」

ill: 通例健康に関して用いるが, evilの同意語として用いることもある

wicked: evilよりもさらに不道徳で, 意図的な悪さを表すが, ときに弱められ, 単にmischievousの意ともなる

naughty: 軽く「いたずらな」の意

source: lazy~ || renjun - 18 | hospital - Wattpad

1. not in full health; sick:

｟主に英｠ ; 〖通例be ～〗 〈人が〉 «…で» 病気で, 気分が悪い(｟主に米｠ sick) «with»

e.g. with submodifier : a terminally ill patient

e.g. her daughter is seriously ill.

2. attributive poor in quality:

e.g. ill judgment dogs the unsuccessful.

harmful:

｟かたく｠ 〖名詞の前で〗悪い, 非難すべき, 有害な

e.g. she had a cup of the same wine and suffered no ill effects.

hostile:

悪意のある

e.g. it did give rise to a lot of ill feelings.

(especially of fortune) not favorable:

｟かたく｠ 〖名詞の前で〗不運な, 都合の悪い, ためにならない

e.g. no one less deserved such ill fortune than McStay.

1. usually in combination badly, wrongly, or imperfectly:

〖形容詞を作って〗ひどく［悪く, 不当に］….

e.g. it ill becomes one so beautiful to be gloomy

e.g. some of his premises seem ill-chosen.

unfavorably or unpropitiously:

都合悪く, (運･縁起などが)悪く

e.g. something which boded ill for unwary golfers.

2. only with difficulty; hardly:

｟かたく｠ 不十分［不完全］に; ほとんど…ない

e.g. she could ill afford the cost of new curtains.

1. (as plural noun the ill) people who are ill:

e.g. a day center for the mentally ill.

2. (usually ills) a problem or misfortune:

｟かたく｠ ; 〖通例～s〗 問題, 困難

e.g. a lengthy work on the ills of society.

evil; harm:

｟文｠ 害悪, 悪, 不幸.

e.g. how could I wish him ill?

| ˌil əd ˈēz | uncomfortable or embarrassed.

speak ill of (or think ill of)

say (or think) something critical about.

On the punctuation of ill in compound adjectives, see usage at well1, as the same rules apply.

Middle English (in the senses ‘wicked’, ‘malevolent’, ‘harmful’, and ‘difficult’): from Old Norse illr ‘evil, difficult’, of unknown origin.