Unquiet comes from un- ('not') + quiet, from Old French quiet, from Latin quietus ('at rest, calm'), past participle of quiescere ('to rest'). The historical chain includes Old English un- and Latin quietus. The quoted older senses, "not", "at rest, calm", and "to rest", supply the semantic anchors for unquiet. The formation is best read as compound, participial, and borrowed: the word unquiet carries its older form-history into a compact English lexical shape. In present English it is used as a adj, "restless, anxious, or turbulent". English derivatives include unquietly and unquietness; related English forms include quiet and quietness. The result is a adj whose etymology preserves both the older form and the later English specialization.