[ἐθελοθρησκεία] from G2309 and G2356; voluntary (arbitrary and unwarranted) piety, i.e. sanctimony
Usages throughout the bible
Colossians 2:23
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Which things have indeed a shew of wisdom in will worship, G1479 and humility, and neglecting of the body; not in any honour to the satisfying of the flesh.