There are a variety of synonyms for the adverb 'rotatively'. Some options might include: "cyclically", "sporadically", "recurrently", "periodically", "alternately", or "interchangeably". Each of these words suggests a different pattern or rhythm of repetition, which might be useful depending on the context in which "rotatively" is being used. For example, "cyclically" might suggest a regular, predictable rotation, while "sporadically" might imply a more irregular, unpredictable pattern. Similarly, "alternately" would suggest a pattern in which two or more things are taking turns, while "interchangeably" might imply that two or more things are being used in rotation without any specific order.