をものともせず（に）Undaunted by
をものともせず（に） says that someone takes determined action without being deterred by a serious obstacle. It usually presents that courage, resilience, or commitment with admiration.
Serious obstacles and determined action
The noun before the expression names the obstacle. The following verb must show that the subject continued or acted boldly despite it.
救助隊は激しい吹雪をものともせず、遭難者の捜索を続けた。
Undeterred by the fierce blizzard, the rescue team continued searching for those who were missing.
Analyze住民たちは周囲の反対をものともせずに、古い劇場の保存運動を続けた。
Undeterred by opposition around them, the residents continued their campaign to preserve the old theater.
Analyze彼は度重なる病気をものともせず、十年をかけて研究を完成させた。
Undaunted by repeated illness, he spent ten years bringing his research to completion.
AnalyzeWhat the expression emphasizes
The focus is not simply that an obstacle was ignored. The obstacle is presented as strong enough to stop an ordinary person, while the subject's action shows that it failed to defeat them. This is why the expression often sounds heroic or admiring.
Resilience versus disregard for risk
をものともせず emphasizes that an obstacle did not defeat someone and usually sounds admiring. By contrast, を顧みず emphasizes acting without considering danger or consequences; depending on context, that can sound brave or reckless.
記者は身の危険を顧みず、紛争地帯に入った。
The reporter entered the conflict zone without regard for personal safety.
AnalyzeThis sentence foregrounds the risk that was disregarded rather than the subject's resilience against an obstacle.
More examples
消防士たちは爆発の危険をものともせず、建物に突入した。
Undeterred by the risk of an explosion, the firefighters rushed into the building.
Analyze調査隊は厳しい暑さをものともせず、砂漠での観測を続けた。
The research team continued its observations in the desert, undeterred by the extreme heat.
Analyze彼女は度重なる批判をものともせず、改革の必要性を訴え続けた。
Undeterred by repeated criticism, she continued arguing for the need for reform.
Analyze選手は足の痛みをものともせずに、延長戦を戦い抜いた。
Undaunted by the pain in his leg, the player fought through the entire overtime period.
Analyze研究チームは資金不足をものともせず、試作機を完成させた。
Despite a severe lack of funding, the research team completed the prototype.
Analyze小さな出版社は大手の圧力をものともせず、その調査報道を世に出した。
Undeterred by pressure from major industry players, the small publisher released the investigative report.
Analyze