I think Mark Twain’s comment on simple language is important here. Keep it plain and simple. Big, complicated words are fine here and there but when overused they can really disrupt the pace of what you are saying.
Also, using these types of words can turn a reader off if they are constantly met with a word they don’t understand. While I like to think I know a fair few words when I’m having to looking up the meaning of two words in one sentence it can really affect someone’s enjoyment of the story. In this case, i didn’t know the definition of vexatious, and then because I rarely see replicant I had to double check it (which in this case I’m not sure it fits).
As they say, simplicity is best.