verb
past tense of concern, meaning to be worried or troubled about something
adjective
feeling worried or troubled about something
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The stakeholders are concerned about the impact of the new policy on the company's bottom line.
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I'm concerned that the project deadline might be too tight for us to meet.
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She's concerned that her crush doesn't like her back.
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The dark clouds gathering on the horizon concerned the villagers as they feared a storm was approaching.