THESAURUS
voluntarily
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
ROGET THESAURUS
voluntarily
Will
N
will, volition, conation, velleity, liberum arbitrium, will and pleasure, free will, freedom, discretion, option, voluntariness, spontaneity, spontaneousness, originality, pleasure, wish, mind, desire, frame of mind, intention, predetermination, selfcontrol, determination, force of will, voluntary, volitional, willful, free, optional, discretional, discretionary, volitient, volitive, minded, prepense, intended, autocratic, unbidden &c (bid), spontaneous, original, unconstrained,
voluntarily, at will, at pleasure, a volonte, a discretion, al piacere, ad libitum, ad arbitrium, as one thinks proper, as it seems good to, a beneplacito, of one's won accord, of one's own free will, proprio motu, suo motu, ex meromotu, out of one's won head, by choice, purposely, deliberately, stet pro ratione voluntas, sic volo sic jubeo, a vostro beneplacito, beneficium accipere libertatem est vendere, Deus vult, was man nicht kann meiden muss man willig leiden.