The bound morpheme non is the negator for life-threatening here, so 'life-threatening' is more coherent. This does not come across with nonlife-threatening, which would seem to imply a threat to non-life. Except non is not an english word, it is a prefix of latin origin.

British rules differ, and … Is there any difference in usage between inconclusive and non-conclusive (nonconclusive)? Inconclusive is more popular in research compared to non-conclusive, using pubmed search, 20,872 and 260

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