nonmetrical

/ˌnɑnˈmɛtrɪkəl/
adjective
  1. Not having a regular poetic meter; not written in verse with a consistent rhythm.
    • The poet experimented with nonmetrical lines that flowed like natural speech.
    • The teacher explained that nonmetrical writing can still be powerful and expressive.
    • Many modern poems are nonmetrical, breaking away from traditional rhyme and rhythm.
Antonyms
What does "nonmetrical" mean? | whatsthatwordmean | whatsthatwordmean