Definitions
1.NounAn unimportant person; a nobody, a nonentity.
2.NounSomething of less importance than its treatment suggests; also, something which is bland or unremarkable in appearance or impact.
3.NounA matter of no concern, especially one that had been of concern; a non-issue."The forecasted megastorm turned out to be a huge nothingburger."
4.AdjectiveOf less importance than its treatment suggests; insignificant, unimportant; also, bland or unremarkable in appearance or impact.