Gormless is old Norse

gormless
ˈɡɔːmləs/
adjective

Bio informatics.
adjective: gormless
  1. lacking sense or initiative; foolish.
    “a constantly grinning, rather gormless boy”
Origin
mid 18th century (originally as gaumless ): from dialect gaum ‘understanding’ (from Old Norse gaumr ‘care, heed’) + -less.