nothingburger
/ˈnʌθɪŋbəːɡə/noun
RareNot in standard dictionaries
1
An unimportant person; a nobody, a nonentity.
2
Something of less importance than its treatment suggests; also, something which is bland or unremarkable in appearance or impact.
3
A matter of no concern, especially one that had been of concern; a non-issue.
Thesaurus
#informal