In his novel The Long Walk, Stephen King writes:
How must it have been, dry-humping that wane, willing flesh?
It seems to me that "wane" is being used as an adjective in this instance, however I haven't been able to find any Dictionary entries with senses of "wane" under an Adjective heading.
Is King using "wane" here as an adjective, and if so, or if not, what would it mean in this instance?