The term "acceptable degree" refers to a level of excellence or adequacy that is deemed satisfactory or suitable enough to meet certain standards or expectations. Opposites or antonyms of this term may include inadequate, insufficient, unsatisfactory, or unacceptable levels of performance or achievement. Moreover, subpar, below-par, low-grade, or mediocre can be used as antonyms for acceptable degree. These words denote levels of attainment, which are below the expected or desirable level. Therefore, it is essential to strive for excellence and avoid mediocrity or substandard levels to stay competitive and meet the expectations of society.