Bad poetry is a subjective term, but there are several synonyms that come to mind when describing mediocre or poorly-crafted verse. One such synonym is "doggerel," which refers to verse that is clumsy, irregular, or poorly-written. Another is "hackneyed," which describes poetry that is unoriginal or over-used. "Cliched" is another apt descriptor for unoriginal poetry that lacks creativity or originality. "Trite" is a useful word to describe poetry that is unoriginal or banal, lacking depth or substance. Finally, "maudlin" refers to overly sentimental or self-indulgent poetry that can be seen as insincere or melodramatic.