badly

Compared meaning: to a severe or serious degree (adverb).

比较义项：严重地（副词，表示程度深、情况严重）。

• seriously

  Formal and often clinical in tone; the standard choice for describing severe illness or injury (seriously ill, seriously injured); unlike badly, it never means 'poorly' and rarely modifies everyday needs or wants.

  语气正式，常带有医疗、临床色彩，是描述严重疾病或伤势的标准用词（如 seriously ill、seriously injured）；与 badly 不同，它绝不表示“拙劣地”，也很少修饰日常的需要或想要。

  Her grandmother is seriously ill and has been in the hospital for two weeks.

  她的祖母病得很严重，已经在医院住了两周。

• badly 本词

  Informal and very common in everyday speech for severe harm or strong need (badly hurt, badly beaten, badly needed); it is ambiguous, since badly can also mean 'poorly', and it rarely combines with formal words like ill.

  口语化，日常表达中十分常见，用于表示严重的伤害或强烈的需要（如 badly hurt、badly beaten、badly needed）；它本身有歧义，因为 badly 也可以表示“拙劣地”，而且很少与 ill 这类正式词搭配。

  The boxer was badly beaten and could barely stand after the fight.

  那名拳击手被打得很惨，赛后几乎站不起来。

Seriously and badly both mean to a severe degree. Seriously is formal, the standard word for illness or injury, as in seriously ill. Badly is informal, for strong harm or need, as in badly hurt or badly needed, but it can also mean 'poorly'.

seriously 和 badly 在表示“严重地”这一程度义上较为接近，但语域和搭配不同：seriously 更正式，常见于医疗、新闻等语境（如 seriously ill）；badly 更口语化，常见于日常表达（如 badly hurt、badly beaten），且本身还兼有“拙劣地”的意思，需靠语境区分。这里不比较 seriously 表示“认真地”的义项（如 take something seriously），也不比较 badly 表示“拙劣地”的义项。

Compared meaning: done in an unsuccessful or unskilled way (adverb).

比较义项：表现不佳地，做得不好（副词）。

• badly 本词

  The more common, general-purpose word for doing something in an unsuccessful or unskilled way; also frequently used as an intensifier meaning 'severely' or 'urgently' in other contexts (not compared here).

  更常用、更通用的词，指做某事不成功或缺乏技巧；也常作为强调词表示“严重地”或“急需地”用于其他语境（此处不作比较）。

  He played so badly that the coach pulled him off in the second half.

  他表现得太差了，以至于教练在下半场把他换下了场。

• poorly

  A slightly more formal or measured alternative to 'badly', often used to describe performance or results; in informal British English it can also work as an adjective meaning 'unwell' (not compared here).

  比“badly”稍显正式、语气更克制的替代词，常用于描述表现或结果；在非正式英式英语中，“poorly”也可作形容词表示“身体不适”（此处不作比较）。

  Sales performed poorly in the last quarter despite the new marketing campaign.

  尽管有新的营销活动，上一季度的销售业绩仍然表现不佳。

Badly and poorly both mean done in an unsuccessful way. Badly is the more common, general word, and elsewhere can also mean 'severely' or 'urgently', as in badly injured. Poorly is more formal, describing performance or results; in informal British English it can mean 'unwell'.

“badly”和“poorly”在此均表示“做得不好、不成功”，语气和使用场景高度重合，“badly”更口语化、使用频率更高，“poorly”略显正式、克制。此处不比较“badly”作强调词表示“严重地／急需地”（如badly injured）以及“poorly”作形容词表示“身体不适”的非正式英式用法。