Unadulteratedly is from unadulterated + -ly. Adulterate comes from Latin adulteratus, past participle of adulterare ('to corrupt, falsify'), from ad- ('to') + alter ('other'). Important recorded forms include un- (Old English), adulterare (Latin), and alter (Latin). Morphologically, the un- element marks negation, reversal, removal, or deprivation, while the base supplies the action, quality, or state being denied or undone. The modern sense is largely compositional, with the historical elements narrowing into a stable English lexical item. In current use it covers in a pure or unmixed manner; utterly. The wider family includes related words such as unadulterated, adulterate, adulteration, and adulterant.