Last year in AP english my teacher had us use a system to help us memorize the 20 words we were given each week. I've found it really, really works! So hopefully it will work for you too! So what you do is make flash cards connect a memory/some other kind of trigger that is in part of the word and you highlight that section. For example, "obstreperous" means noisy/boisterous, and for that word I would underline "strep" because whenever I have strep throat I can't talk and therefore I am not obstreperous, or noisy. That seems kind of stretching it, but it really helps for a lot of people. Another example would be "abrogate" which means to cancel, and I would highlight "bro" because a bro doesn't cancel on your plans. Haha it's really kind of stupid but highly effectual. You should try it out