This is what I got both from my personal experience and from the dictionary: brief is just short. But if something is concise it is brief and efficient- using few words to express something complicated well enough to be understood. So something can be brief because it is concise or because it’s just a simple concept.

I agree with both Lily and Reilly. Brief = short (in time duration). Concise = short and efficient (often in writing). Brief can sometimes be used to mean concise but concise cannot be used to mean brief. Ex 1)This morning, I had a brief phone call. CORRECT This morning, I had a concise phone call. WRONG Ex 2) When you write an email to your professor, please be concise. CORRECT When you write an email to your professor, please be brief. CORRECT (this is still correct, but I think "concise" fits better in this situation. Please be brief means use as few words as possible. Please be concise means try to use as few words as possible to explain your idea clearly/efficiently)

they are very similar words. brief means quick or short (as in time or length) concise means brief, but also complete and/or informative. it is associated with information and communication i associate the word “concise” with efficiency and purpose, whereas “brief” doesn’t necessarily have intention behind it. for example, a brief essay is probably short because the writer got a little lazy and wanted to stop writing, while a concise essay is likely edited and intentionally short. but that doesn’t mean that “brief” is always negative— you might send a brief letter to a friend, for example, to stay in touch with them, or you might eat a brief meal so that you aren’t late for work. also, “brief” is a more fluid word, and you can use it to describe a wider variety of things, while concise is more typically associated with writing and communication for example: a brief meeting a brief meal a brief walk (you would not use concise for any of these) versus a concise letter, a brief letter a concise speech, a brief speech a concise argument, a brief argument

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