[pen] I doubt if one blithering idiot is more likely to be of use to the nation than another in an emergency. Thanks for bringing the news to my attention though - I didn't know anything about it till now.

[Phil] One example in standard English occurs to me: to black (a pair of boots, or a place of work).

Similarly, "to right something" and perhaps also (less clear) "to wrong someone"?

[Raak/CdM] However, "black" is also a noun. So is "wrong" and "right." Can an example be found which verbs an adjective which is not also a noun?

I was going to point out that "to up prices" involves verbing a preposition, but "up" can yet again be used as a noun.

Of course, in programming you can talk about "anding" and "oring" two numbers, but that falls more into jargon than standard English.

Loose?

Isn't that just a contraction of 'let loose', in which case 'let' is the verb?

Turpentine can be used to thin oil paint.

The map is ornated with three cartouches.

When the ossibuchi have browned on one side, turn them to brown the other.

(Ok, "brown" can be a noun, but I just like saying "ossibuchi".)

[challenge] I actually think instances of verbed nouns-not-usable-as-adjectives are even rarer than instances of verbed adjectives-not-usable-as-nouns. However, I did find an example of a verbing of a non-adjectival noun: You can tree a cat. BTW Calvin's only 12 years younger than I am. He'd be 26 sometime this year. Yeesh!