worrywart
noun [ C ] US informal uk/ˈwʌr.i.wɔːt/ us/ˈwɝː.i.wɔːrt/
杞人忧天的人;总是担心的人
a person who often worries, especially about things that are not important
Don't listen to him - he's just an old worrywart. 别听他的——他只是个杞人忧天的老家伙。
Synonym: worrier