"Came up to snuff" is an idiomatic expression that means to meet the necessary standard or level of quality. Antonyms for this phrase include "fell short," "missed the mark," "failed to measure up," "below par," "substandard," and "inferior." These words denote a lack of proficiency or quality, indicating that the subject did not meet the expected requirements. If something did not come up to snuff, it is likely that it was disappointing or not satisfactory in some way. By contrast, when something has reached the desired level of quality, it can be described as impressive, excellent, or top-notch.