[monochromatic]

It's basically a skunked term at this point. No matter which sense you use it in, some subset of your readers is going to take umbrage.

There are other, better, words available that can take its place.

[eropple]

There are better words, sure, but if you're going to be That Guy Who Literally-Literally Everyone Hates And Nobody Wants To Ever Talk To...be right.

Because, I mean, if you're going to be That Guy etc. etc., being right is close to the only thing you've got left.

[monochromatic]

I'm not saying I'd bring this up in casual conversation. Just that it's a word I personally choose not to use in my writing.