The antonyms for the phrase "brought end; leave unfinished" are quite simple. The opposite of brought an end is to start or initiate while the opposite of leave unfinished is to complete or finish. Bringing an end to something means to stop, halt or conclude it while leaving something unfinished means leaving it incomplete, half-done or undone. Therefore, to find the antonyms of the aforementioned phrase, we need to look for words that signify initiation, starting or completion of something. Antonyms are important because they add diversity and depth to our language and communication. Knowing antonyms can help in expressing ideas and thoughts accurately.