Most on and off means something that is inconsistent or irregular. There are several synonyms for this phrase, including intermittent, sporadic, erratic, inconsistent, irregular, and infrequent. These words refer to something that occurs irregularly or not according to a regular schedule. For example, an intermittent rainfall is when it occurs inconsistently or not continuously. Sporadic behaviour is displayed by someone who acts without any predictable pattern or rhythm. Erratic displays someone's unpredictable movements or behaviour. Each word has slight variations in meaning, but all encompass the idea of inconsistency. Using these synonyms can add more diversity and liveliness to your writing.