The term "most ever present" signifies something that is constantly around or ubiquitous. Its antonyms could be words such as rare, scarce, infrequent, occasional, or sporadic. Rare suggests something that does not happen often, making it the exact opposite of most ever present. On the other hand, scarce indicates a significant shortage, indicating a deficiency. Infrequent describes something that occurs sometimes but not regularly, whereas occasional specifies that something happens once in a while. Finally, sporadic refers to something that is irregular or inconstant in frequency. All of these terms contradict the idea of something being most ever present, indicating its absence or lack of regularity.