troubling

US /ˈtrʌb.əl.ɪŋ/
UK /ˈtrʌb.əl.ɪŋ/
1.

Something that is troubling makes you worried or nervous:

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Some troubling questions remain about the legal status of frozen embryos.
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troubletroubledgive troublespell troubleasking for troubleget someone into troublefish in troubled waters