The common thread running through nearly all critiques of Fair-eyes has been that much of the language is too sophisticated for the age of my target audience. I have therefore just completed an exercise (not yet posted) of going through trying to imagine how a 10 year old might percieve it and simplifying the language where necessary and possible. I'm still not quite there yet though. On the way through I noted down any words I wasn't quite sure about. With further revisions I've managed to whittle it down from 97 to just 33 "dubious words". Now I think I need some help.
I should be very grateful if anyone has the time to consider the following list of words and let me know which they think are likely to be understood by the average 10 year old. In the case of those you don't consider appropriate, any alternative words or phrases to convey the same concept would be welcomed.
Agility, Apprehension, Begrudgingly, Biped, Composure, Currency, Economy, Enclave, Gravitas, Humiliation, Inanimate, Incompetence, Inverse, The Latter, Megalomaniac, Metaphor, Metaphysical, Misgivings, Mystique, Ornate, Philosophical, Photon, Pièce de résistance, Precariously, Predicament, Provisions, Reconnaissance, Remorse, Sceptical/Scepticism, Subtlety, Subversive, Tangible, Unprecedented.

Considering that it for 10 YO's I would hope it is meant to be educational. I would suggest you keep the words and add a description.
I was with a six yo the other night in a restaraunt. An advertisment caught his eye it had the word Complexion, the big word did not faze him, he simply asked for an explanation.
So provide an explanation in the narrative.