You can use comparatives, like "simpler", usually without issues. Something can be simpler than something else without necessarily being simple. Superlatives li

You can use comparatives, like "simpler", usually without issues. Something can be simpler than something else without necessarily being simple. Superlatives like "simplest" can sometimes be used as well. After all, being the simplest thing means to be simpler than all the other things; still not necessarily simple. It's only the positive form "simple" which is problematic and should be almost always avoided.