When expressing the idea that something is not consistent, there are several synonyms at your disposal. For instance, you could say that something is unpredictable, unstable, or unreliable. You could also describe it as varying, fluctuating, or irregular. These words suggest that there is no clear pattern or pattern is uncertain, seasonable as such. It can also be described as contradictory, conflicting, or opposing. Finally, if something is repeatedly inconsistent, you could use expressions like hit or miss or haphazard to describe it. These synonyms for the term "be inconsistent" allow for greater flexibility and nuance in describing the lack of consistency in any given situation.