hoydenism

/ˈhɔɪdənɪzəm/
noun
  1. The behavior or spirit of a hoyden; tomboyishness or boisterous, unruly conduct in a girl or young woman.
    • The school discouraged hoydenism, insisting that young ladies behave with decorum.
    • Her hoydenism was tolerated by her family, who admired her energy even when it led to broken vases.
    • In the 19th century, hoydenism was often seen as a phase that girls would outgrow.