The story
- Proto-Germanic · inherited from*barniskaz“childish”
- Old Norse · derived frombernskr“childish”
- Old English · inherited from*bearnisċ
- Middle English · inherited from*bernis
- English todaybairnish
From Middle English *bernis, *barnisch, from Old English *bearnisċ and Old Norse bernskr (“childish”), from Proto-Germanic *barniskaz (“childish”), equivalent to bairn + -ish. Cognate with Gothic 𐌱𐌰𐍂𐌽𐌹𐍃𐌺𐍃 (barnisks, “childish”).
Etymology from Wiktionary, CC BY-SA 4.0.