をものともせずに means "undaunted by", "braving": someone faces a hardship and goes ahead anyway. It follows a noun naming the obstacle – injury, bad weather, opposition, danger – and the main clause says what the person did in spite of it. Literally it is "not even treating ~ as anything".
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He continued to pursue his dream, undaunted by the opposition around him.
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She competed in the tournament in defiance of her illness.
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The mountaineer headed for the summit in defiance of the bad weather.
is the written negative of
, the same as
, and に is often dropped: をものともせず has the same meaning.
Who it describes
The phrase admires someone else's courage, so its subject is another person, a team or a company, not the speaker. Said about yourself it sounds like boasting. The main clause reports what happened; it does not carry a request, an intention or a wish.
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The athletes fought with all their might to the end, unfazed by the intense heat.
- × 私は怪我をものともせずに走った → 私は怪我をしていたが、最後まで走った
- × 雨をものともせずに出かけよう → 雨でも出かけよう
をものともせずに or にもかかわらず
is a neutral "despite" and says nothing about courage. It works for things that simply happened, and for the speaker. をものともせずに always means a person stood up to the difficulty.
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Despite the rain, the match went ahead.
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The boy kept running toward his family, undeterred by the storm.
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The phrase is written and formal: news reports, biographies, speeches. In conversation, 〜～ says much the same.
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He didn't let the injury beat him and ran to the end.
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