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I'm not sure exactly if you're looking for a definition of the adjective "repetitive", or if you know what it means, but you just don't know how to say it in Esperanto.
If the former, "repetitive" can mean one of two things, depending on whether the qualified term is the agent (i.e., performing the action) or the direct object (i.e., undergoing the action):
1. (qualified term is the agent): repeating a given act often or multiple times, usually excessively, especially if that act is communicative, such as speech or writing; having a tendency to repeat often or multiple times, usually excessively; reformulating the same statement or gesture in multiple different ways, usually excessively, or having a tendency to do so. For instance, "You're being repetitive" means "You're repeating yourself too much"
2. (qualified term is the direct object): repeated often or multiple times, usually excessively, especially if the repeated act is communicative, such as speech or writing; reformulated in multiple different ways, usually excessively, or having a tendency to do so; containing an excessive amount of repetition (usually of speech or writing). For instance, "repetitive term" means "a word or phrase used over and over too many times"; "repetitive writing" means "writing that tends to use certain words or phrases over and over excessively, either individually or collectively, even if those repetitions are reformulations of the same idea".
Regarding translation into Esperanto, a few possibilities come to mind, depending on the exact nuance desired, and depending on if it describes an agent or a direct object (see above definitions). I'm assuming you know Esperanto well enough to figure out what these words mean:
rea
reada
reobla
reoblada
refoja
refojega
multfoja
plurfoja
ripeta
ripetata
ripetigha
ripetanta
ripetema
refarema
redirema
Hope that helps!