What is the synonym of the 'brief'?

Brief's synonym is concise.

Brief:
English meaning: of short duration; not lasting for a long time.
Bangla meaning: সংক্ষেপ, সংক্ষিপ্ত, সারসংক্ষেপ।
Example : The CEO gave a brief overview of the company's financial performance.

Concise:
English meaning: giving a lot of information clearly and in a few words; brief but comprehensive.
Bangla meaning: সংক্ষিপ্ত, সারসংক্ষেপ।
Example : The article provided a concise summary of the main findings of the research study.

In addition,

Lengthy:
English meaning: lasting or taking a long time; extended.
Bangla meaning: দীর্ঘ, লম্বা, ব্যবধানবিশেষক, প্রসঙ্গবিশেষক।

Expansive:
English meaning: covering a wide area in terms of space or including a wide range of subjects.
Bangla meaning: প্রসারণশীল, প্রসারণমূলক, বিস্তৃত।

Curt:
English meaning: rudely brief or abrupt in speech or manner.
Bangla meaning: তীব্র, সংক্ষেপ, বদমেজাজি, অভাদ্র।

Source: Cambridge dictionary