wearm
From Proto-Germanic *warmaz (compare Old Frisian warm (West Frisian waarm), Old Saxon warm (Low German warm), Dutch warm, Old High German warm (German warm), Old Norse varmr (Danish and Swedish varm), Gothic 𐍅𐌰𐍂𐌼𐍃 (warms)), probably from Proto-Indo-European *gʷʰer- (“warm, hot”), *gʷhormo- (whence Ancient Greek θερμός (thermós), Latin formus), or alternatively from *wer- (“to burn”).
