verb
to feel uneasy or concerned about something; to be anxious or troubled
adjective
causing anxiety or concern; troubling
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The worrying trend of declining sales has caused concern among the board members.
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I find it worrying that he hasn't replied to my messages for days.
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She's been worrying about her grades non-stop.
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The dark clouds hovering above the city were a worrying sign of an impending storm.