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Worrier
Emotional Weight
Understanding 'worrier' includes recognizing the emotional stress it implies, more than just occasional concern. 
Not Always Negative
'Worrier' might sound negative, but it can sometimes imply that the person is careful and conscientious. 
Collocation Context
The term 'worrier' can be intensified; 'chronic' implies constantly worried, 'compulsive' suggests uncontrollable worry. 