adjective
A word that describes or modifies a noun, in this case, 'girlish' describes a characteristic or quality typically associated with a girl or young woman.
She had a girlish charm that captivated everyone in the room.
Her giggle was so girlish, it made everyone smile.
She rocked a girlish outfit that was totally on point.
His girlish innocence was endearing to all who knew him.