When it comes to describing someone or something that is not agile, there are several synonyms that you can use. For example, you could describe something as slow-moving, lethargic, or cumbersome. Another option would be to use words like inflexible, rigid, or lacking dexterity. If you're talking about a person, you could describe them as clumsy, awkward, or ungraceful. Other synonyms might include stiff, unresponsive, or uncoordinated. No matter which word you choose, the overall meaning will be the same: someone or something that is not agile is lacking in speed, flexibility, or gracefulness.