So I'm having a problem and it sometimes frustrates me to know end but after completing a couple courses on memrise and getting into slightly more intermediate words and such, I find that synonyms are more common to see. The issue is that often times I'm left with a vague phrase like to go up. I respond 上る and it marks it wrong then it makes me do 上がる four or five times. Obviously this is a basic example but there are plenty of examples of this through out. The most recent example and the reason for the post is my constant mistaking of answering Serious Matter as 大事 instead of 重大。 Like I recognize the difference when the kanji is laid out but not when I have to type it in with Serious matter being the only clue.

Is there any way to circumvent that? because there are many cases of it and its starting to get annoying.

I use Anki 10k in tandem too, I like it better because I can decide whether I need to repeat it or not. I just find Memrise helps me a lot with quickly learning the words proper spelling and memorizing the kanji a bit better since I only have so much time.