uneven (adj.)youdaoicibaDictYouDict[uneven 词源字典]
Old English unefen "unequal, unlike, anomalous, irregular," from un- (1) "not" + even (adj.). Similar formation in Old Frisian oniovn, Middle Dutch oneven, Old High German uneban, German uneben, Old Norse ujafn. Meaning "broken, rugged" (in reference to terrain, etc.) is recorded from late 13c. Related: Unevenly; unevenness. [uneven etymology, uneven origin, 英语词源]