Oh, I was not aiming at avoiding the similar meaning in English (although that would be even better, if someone with better control of English would suggest one) , I was trying to avoid it being similar in OSM tag name.
Other possible alternatives to demanding_trail:
demanding_byway(I’d like to avoid frequently used OSM term “way”, also it is more road-like)demanding_bypath(more correct, but I’d like to avoid having “path” anywhere in the name, so it can’t be by accident matched by humans, regex or substring)demanding_route(“route” is OSM term for different element type, so best avoided)demanding_course(meaning similar to “route”, so people might be inclined to incorrectly tag it on OSM route instead of a way)demanding_spoor(might be a good match, but maybe somewhat obscure term for non-English speakers, and kind-of implies there is visible track or trail of an animal or person, which while often is a case, might not be really visible at some parts, which is a problem many other terms share too)demanding_progress,demanding_movement, etc. not nouns, but as values ofhighway=key might fit.
Other suggestions?