from The American Heritage® Dictionary of the English Language, 4th Edition
- adv. Whether willing or unwilling.
from Wiktionary, Creative Commons Attribution/Share-Alike License
- adv. Willing or unwilling; willy-nilly.
from The Century Dictionary and Cyclopedia
- n. Unwilling (or) willing; willy-nilly.
Latin nōlēns volēns : nōlēns, present participle of nōlle, to be unwilling + volēns, present participle of velle, to wish, be willing.(American Heritage® Dictionary of the English Language, Fourth Edition)
From Latin nolens ("unwilling"), from nōlō ("I am unwilling") and volens ("willing"), from volō ("I am willing, I will"). (Wiktionary)
 The scattered Christians went abroad throughout Judæa and Samaria; nolens volens they acted as missionaries, i.e., as apostles