Int. Standard Bible Encyclopedia WILL-WORSHIP In Colossians 2:23, "a show of wisdom in will-worship," for ethelothreskia), a word found nowhere else but formed exactly like "will-worship": worship originating in the human will as opposed to the divine, arbitrary religious acts, worthless despite their difficulty of performance.

Multi-Version Concordance Will-worship (1 Occurrence) Colossians 2:23 Which things have indeed a show of wisdom in will-worship, and humility, and severity to the body; 'but are' not of any value against the indulgence of the flesh. (ASV WBS YLT)