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I have this sentence as part of an abstract

Verification of space weather forecasts presents some unique challenges compared with other types of forecasts.

I go on to detail briefly what those challenges are. Now, these aspects aren't, in truth, entirely unique to this area, but are still much more of a factor than in other areas. I am trying to succinctly replace 'unique' with something more suitable.

I have toyed with 'peculiar' or 'idiosyncratic' but neither really appeals. 'Particular' might fit but I'm still not too happy with that.

Unique works because in the context because I think it also conveys a sense of these challenges being interesting, which doesn't come across so much with the other words mentioned.

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.......unusual! – Edwin Ashworth Jan 24 '13 at 23:34
If you want to be "truthful", you can't use unique, so you could settle on Edwin's unusual. Or recast to something like presents some challenges not often encountered with other types of forecasts. But the whole question is really a matter of "creative writing advice", rather than a (not particularly welcome) single-word-request for a term meaning not quite unique, but nevertheless uncommon and therefore interesting. – FumbleFingers Jan 25 '13 at 0:18
Why do you need to modify challenges with anything? "...presents some challenges compared with other types of forecasts" is sufficient to convey the message that "Verifying [Verification of is verbose] space weather forecasts is different from verifying other types of forecasts". Being unique isn't a sufficient condition for being interesting: it may be a necessary condition, however. Verifying space weather forecasts is more challenging than verifying other types of forecasts seems to me to convey all that needs to be said. The challenges--the hook--will be listed in the text. – user21497 Jan 25 '13 at 0:18
It presents some intrinsic challenges? – Autoresponder Jan 25 '13 at 3:18
up vote 2 down vote accepted

Maybe novel captures some of the meaning you're trying to convey? It suggests something out of the ordinary and interesting.

Verification of space weather forecasts presents novel challenges when compared with other types of forecasts.

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"Extraordinary", "uncommon", "incomparable". "Rare" might also work here.

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I would suggest that it presents some particular challenges:

2. Separate and distinct from others of the same group, category, or nature: made an exception in this particular case.
3. Worthy of note; exceptional: a piano performance of particular depth and fluidity.

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