dauntless
adjective literary uk/ˈdɔːnt.ləs/ us/ˈdɑːnt.ləs/
决然的；无畏的
showing determination and no fear
In spite of the scale of the famine, the relief workers struggled on with dauntless optimism. 尽管饥荒非常严重，救援工作者们仍发扬大无畏的乐观主义精神，尽职尽责地努力工作。
Synonyms: brave fearlessintrepid