Nonmetrical refers to not being measured in a regular or consistent way. The antonyms for nonmetrical include metric, rhythmic, regulated, cadenced, measured, and standard. Metric refers to being measured in a standard or precise way, while rhythmic means having a regular or steady beat. Regulated refers to being controlled or standardized, cadenced means having a balanced and harmonious rhythm, and measured refers to being carefully calculated. Finally, standard means being accepted and agreed upon as a model or criterion. These antonyms highlight the importance of regularity, precision, and consistency in measurement and rhythm, which are essential in many fields, including music, poetry, and science.