Meaning

noun (Norse mythology) god of light and peace and noted for his beauty and sweet nature; son of Odin and Frigg and husband of Nanna; killed by Hoth

adjective with no effort to conceal

adjective lacking hair on all or most of the scalp

originSense 1 is borrowed from Old Norse Baldr. Sense 2 is inherited from Old English Bealdhere (a male given name).

Etymology from Wiktionary, CC BY-SA 3.0