I have a lot of promlem with memorizing new words. Things like cards are not effective enought for me, I forget everithing next day. So I try to read as much as I can in my target language. Second interesting way I've found recently it is recording a video diary. When I try to say something, usually I need the same pack of words, so I google then again and again and I memorize them very quickly. If you need to learn some special words, not just expand vocabulary, you can try to tell/write stories using this words.

It is the ways I use, hope it helps!

I add sentences to my flashcards, which helps. I try and make an image in my head. For example the French word berser means to lull or rock or cradle. I have an image of a bear with a plate on it's head standing behind a babies cradle rocking it back and forth. The more unusual or bizarre the image the better. Sometimes I've gone months with a word and it seems like the day I think of an image is the day I remember.

1. Make sentences with the voca

2. Read it aloud, imagining you are in a certain situation that you are speaking to someone :)

If we don't know when we can use all the words, we are likely to forget them :)