willing

Compared meaning: willing to do something (adjective).

比较义项：愿意，乐意做某事（形容词）。

• happy

  Informal and warm, expressing willingness that comes from genuine enthusiasm rather than mere non-refusal; typical of everyday conversation and customer-service offers of help.

  语气随和、口语化，表达的是发自真心的乐意，而不仅仅是不拒绝，常见于日常对话和客户服务中主动提出帮忙的场合。

  The staff were happy to answer any questions we had.

  员工们很乐意回答我们提出的任何问题。

• glad

  Slightly more polite or formal than happy, often used in courteous offers or written requests; still expresses active willingness rather than reluctant agreement.

  比happy稍显礼貌、正式，常用于客气的提议或书面请求中，同样表示积极主动的乐意，而非勉强同意。

  I would be glad to assist you with the paperwork tomorrow.

  我很乐意明天协助你处理这些文件。

• willing 本词

  The most neutral, general-purpose word for willingness, carrying no sense of enthusiasm or reluctance; it can describe minimal or grudging agreement and often appears in negative or concessive clauses.

  是表达愿意这一概念中最中性、最通用的词，不带任何热情或勉强的含义，可以描述最低限度甚至勉强的同意，常出现在否定句或让步句中。

  Few volunteers were willing to work the night shift.

  只有很少的志愿者愿意上夜班。

• disposed

  More formal and abstract, describing a tendency or attitude rather than active eagerness; usually modified by adverbs of degree and suited to institutional or written contexts.

  更为正式、抽象，描述的是一种倾向或态度，而非积极主动的热情，通常由表示程度的副词修饰，适合机构或书面语境。

  The committee seemed favorably disposed toward approving the new proposal.

  委员会似乎倾向于赞成批准这项新提案。

Happy, glad, willing, and disposed all mean willing to do something. Happy is informal, from enthusiasm. Glad is more polite, in courteous offers. Willing is neutral, and can mean reluctant agreement. Disposed is formal, meaning a tendency. 'Joyful' and disposed's 'dispose of' senses aren't compared.

这四个词在表示愿意做某事时含义相近，但正式程度和情感色彩不同：happy和glad语气积极、带有主动乐意的意味，willing最为中性、可涵盖勉强的同意，disposed则更正式、抽象，强调一种倾向。此处不比较happy和glad各自最常用的快乐、高兴义项，也不比较disposed表示处理、处置的其他用法。