troubling
adjective uk/ˈtrʌb.əl.ɪŋ/ us/ˈtrʌb.əl.ɪŋ/
令人烦恼的；令人担忧的
Something that is troubling makes you worried or nervous
Some troubling questions remain about the legal status of frozen embryos. 关于冷冻胚胎的法律地位，仍然存在一些令人忧虑的问题。
Synonyms: alarmingconcerning distressingdisturbingworrisome worrying