List of voluntarily synonyms and voluntarily related words.
advisedly, by choice, by design, calculatedly, consciously, contemplatedly, deliberately, designedly, electively, freely, gratis, gratuitously, in cold blood, independently, intentionally, knowingly, meditatedly, on purpose, optionally, pointedly, premeditatedly, purposefully, purposely, purposively, spontaneously, willfully, willingly, with full intent, with intent, with malice aforethought, with purpose, without coercion, wittingly