Q: lengthy とはどういう意味ですか?
A: 不见得有贬义的意思,只指的长而已。如果说The country has a lengthy history,是中性的。但在有一些情况有一点点贬义的感觉。比如说,如果你看一次演讲,然后说“That speech was quite lengthy." lengthy意味着你觉得这个演讲未免太长了。
Q: lengthy とはどういう意味ですか?
A: It means long


Q: lengthy を使った例文を教えて下さい。
We don’t have time for any lengthy questions.
The play was rather lengthy.


Q: lengthy と long はどう違いますか?
A: I think the difference is mostly in collocation, or the way we tend to use each word for no reason in particular--just the way the language has evolved. This will vary from region to region, and even from person to person, but for me here are some common collocations:

--a lengthy response
--a lengthy negotiation
--lengthy discussions
--a long discussion
--a long book
--a long movie
--a long line (for example at the bank...)
Q: lengthy と length はどう違いますか?
A: Lengthy describes something that takes a long time to listen to, watch, endure, etc.
A lengthy speech
A lengthy explanation
A lengthy article
A lengthy waiting period

Length is a measurement of how long something is physically or of how much time something takes:
What is the length of this couch? (How long is this couch?)
You can measure the length, width, and height of an object.
The length of time you should wait before swimming is about 30 minutes.


Q: It's lengthy in vain. この表現は自然ですか?
A: QAの全文をご確認ください