The antonyms for the word "more fathomless" include "shallow," "superficial," and "limited." These words convey a sense of restriction or constraint, indicating that the depth or scope of something is finite or easily discerned. Whereas "more fathomless" implies an endless abyss or complexity, antonyms like "shallow" suggest a lack of depth or substance. Similarly, "superficial" denotes an emphasis on surface-level qualities rather than deeper, underlying factors. Finally, "limited" implies a boundary or boundary line that clearly defines the range of something. In contrast to the endless expanse of "more fathomless," each of these antonyms emphasizes a degree of closure or finality.