The antonyms for the word "being long" include "being short, brief, concise, succinct, and curt." When we refer to something that is "long," we generally mean that it is extended in length, duration, or time. The opposite of being long suggests that something is short or brief, meaning it is not extended but rather is contained within a limited period of time or space. Being concise, succinct, or curt implies that we are able to convey a message or idea with brevity, precision, and clarity. While being long can sometimes be useful, being short and to the point can also be beneficial in many situations.