The antonyms for the phrase "begins where left off" could be "abandoned, discontinued, halted, or suspended." These words signify a break, interruption or termination of an activity, without any plans or prospects of continuing from the same point. When something is left off, it indicates that there would be a recommencement or resumption from the same point. Conversely, the antonyms infer the non-existence of the second part or the possibility of starting from a different point. Though these words have negative connotations, they are necessary to express the opposite of the positive phrase "begins where left off.