no laughing matter
US /noʊ ˈlæfɪŋ ˈmætər/
UK /noʊ ˈlæfɪŋ ˈmætər/

1.
no es cosa de risa, asunto serio
a serious issue or situation that should not be treated lightly or joked about
:
•
The company's financial problems are no laughing matter.
Los problemas financieros de la empresa no son cosa de risa.
•
Climate change is a serious threat and no laughing matter.
El cambio climático es una amenaza seria y no es cosa de risa.