Unrest

wiktionary

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From Middle English unreste, equivalent to un- +‎ rest. Cognate with West Frisian ûnrêst(“unrest”), Dutch onrust(“unrest”), German Low German Unrüst(“unrest”). Compare also Saterland Frisian Uunraue(“unrest”), German Unruhe(“unrest”), Danish uro(“unrest”), Swedish oro(“unrest”), Icelandic órói(“unrest”). Compare also Old English orrest(“battle”), Old Norse orrosta, orresta(“battle”).

etymonline

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unrest (n.)

mid-14c., from un- (1) "not" + rest (n.). Similar formation in West Frisian onrest, Middle Low German unreste, German unrast, Middle Dutch onruste.