from dictionary.com:

wily \Wil"y\, a. [Compar. Wilier; superl. Wiliest.] [From Wile.] Full of wiles, tricks, or stratagems; using craft or stratagem to accomplish a purpose; mischievously artful; subtle. 

Syn: Cunning; artful; sly; crafty.

How many "wily adversaries" can be subdued by having them bite into a barbed steel hook?

And why do they always insist on telling us how many "firing days" the thing will be manufactured for?

What does that MEAN to me, personally?