ものともせず
monotomo sezu

Expression

1. thinking nothing of ...; undaunted by ...; in defiance of ...; in spite of ...; in the face of ...; ignoring ...; paying no attention to ...

Usually Written in Kana
そのおてんば むすめ危険 きけんをものともせずにその のぼった。
sono otembamusumewa kiken'o monotomo sezuni sono kini nobotta.
The reckless girl climbed the tree regardless of danger.