'untamably' originates from English, specifically from the adjective 'untamable', formed by the prefix 'un-' (meaning 'not') + 'tamable' (from 'tame' + suffix '-able'), with the adverbial suffix '-ly' added to form the adverb.

'untamably' developed from Middle English/early modern English patterns: Old English 'tam' (tame) → Middle English 'tame' → adjective formed with 'un-' + '-able' ('untamable') → adverb formed by adding '-ly' ('untamably').

Initially it denoted simply 'not able to be tamed'; over time it has come to be used as an adverb meaning 'in a manner that cannot be tamed' or 'uncontrollably'.