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lengthy + noun
lengthy 常用来修饰抽象名词，如 discussion, process, list 等。
The meeting was a lengthy discussion.
这个会议是一场冗长的讨论。
冗长的；漫长的
先理解核心含义，再看它在真实句子里的用法。
冗长的；漫长的
Relatively long in duration; tediously protracted
The meeting was a lengthy discussion.
这个会议是一场冗长的讨论。
有长度的；长的,尤其指时间而非尺寸
Having length; long and overextended, especially in time rather than dimension.
长篇大论的；冗长的
Speaking or writing at length; long-winded.
The meeting was so lengthy that many people started to lose focus.
会议如此冗长，以至于许多人开始走神。
After a lengthy debate, the committee finally reached a decision.
经过长时间的辩论，委员会终于做出了决定。
She wrote a lengthy letter to explain her reasons for leaving.
她写了一封长信来解释她离开的原因。
lengthy 常用来修饰抽象名词，如 discussion, process, list 等。
The meeting was a lengthy discussion.
这个会议是一场冗长的讨论。
主语通常为事件或文本，表示‘持续时间长’或‘篇幅长’。
His speech was too lengthy for the audience.
他的演讲对观众来说太冗长了。
用于描述逐渐变长的过程。
The negotiations grew lengthy as both sides refused to compromise.
由于双方拒绝妥协，谈判变得漫长。
Not this
The meeting lengthy.
Use this
The meeting was lengthy.
形容词 'lengthy' 不能单独作谓语，需要系动词 'be'。
Not this
This is a lengthy rope.
Use this
This is a long rope.
'lengthy' 通常指时间冗长，修饰物理长度应用 'long'。
Focus on the distinctions below. Other candidates are kept compact until a reliable usage note is available.
漫长的过程
Getting a visa can be a lengthy process.
获得签证可能是一个漫长的过程。
冗长的讨论
The committee had a lengthy discussion about the budget.
委员会就预算进行了冗长的讨论。
长时间的延误
Passengers faced a lengthy delay due to technical issues.
由于技术问题，乘客们面临长时间的延误。
长篇演讲
The president delivered a lengthy speech on economic reform.
总统就经济改革发表了长篇演讲。
冗长的文件
Please review this lengthy document before the meeting.
请在会议前审阅这份冗长的文件。
Use lengthy naturally, then get feedback on meaning, tone, grammar, and phrasing.
Revisit a common error or keep this word in your review list.
联想 length（长度）+ y，像极长的线段延伸无尽，表示'冗长的'。
register: mixed, contexts: 文件/会议/演讲/过程, note_zh: 通常用于形容时间或篇幅上持续过长，中性偏正式，书面和口语均常见。
常用于描述时间或文章冗长，比较级和最高级为 lengthier 和 lengthiest。
Dictionary facts from ECDICT, WIKTIONARY.