Then when we say 'in'hibit we are actually saying allowed or assists. But it's the opposite of prohibit. So my input would be to use the one that best conveys your message, of course while maintaing proper grammar! :)

John-six years later (hence the delay in response) I'm reading this blog bc my 'smartphone' didn't recognize inopportune. I had to respond to your post because of your attempt to summarize the comparative meanings while using the following phrases. '"I dislike John." She/or "John is unlike anyone I've ever met." I certainly recognize them as describing John or a feeling about John but clearly the word like isn't used in the same context in both statements. Obviously the second 'like' wouldn't be defined as a feeling but rather an opinionated characteristic. I thi.nk that's why that particular word and context it was used in disintegrated the validity of your argument. That said, I struggled bw 'in,' 'un,' and maybe 'im.'I never considered 'dis'opportune. (Sorry for the repeat below but I'm on my phone and am unable to scroll down to dekete/edit or even read what I'm writing.
." I never i'opportune.' I think 'dis' means can be undeestood and used differently with different words and cintexts. Incmy humble rather uneducated opinion dis is used in the context of 'was once' or perhaps 'was once thought to be/could've been' whereas I think of 'un,' 'in,' and 'im' as just not.