unmetrical
/ˌʌnmɛtˈrɪkəl/Definitions
1. adjective
Not having a regular or rhythmic meter; lacking musical quality or harmony.
“The poet’s unmetrical language was a deliberate choice to create a sense of disorder in the narrative.”
2. noun
A verse or line of verse that lacks a regular or rhythmic meter.
“The editor had to revise several unmetrical lines to make the poem flow smoothly.”