The antonyms for the term "natural scale" may vary based on context. However, some common antonyms for the word "natural" include "artificial," "synthetic," "manufactured," "fabricated," "unnatural," "contrived," "pretended," and "affected." For the term "scale," antonyms include "unbalanced," "nonlinear," "illogical," "disproportionate," and "inconsistent." When put together, antonyms for "natural scale" may refer to an artificial, disproportionate, or inconsistent representation of a range or continuum. For example, an "artificial scale" may refer to a structure imposed on a system or object to measure its parameters, instead of a naturally occurring scale.