freely (adv.) Look up freely at Dictionary.com
Middle English frely, from Old English freolice "of one's own accord, readily;" see free (adj.) + -ly (2). Meaning "unstintedly; plentifully" is from c.1300; that of "without constraint, under free conditions" is from 1590s. Similar formation in Middle Low German vrilike, Dutch vrijelijk "freely," German freilich "to be sure."