unbonneted

/ʌnˈbɒnɪtɪd/
adjective
  1. Not wearing a bonnet or hat; having the head uncovered.
    • The children ran unbonneted through the sunny meadow.
    • In the painting, the woman is unbonneted, her hair flowing freely.
    • It was considered improper to appear unbonneted in public in those days.
Synonyms