Definition of unbirthday in English:


Syllabification: un·birth·day
Pronunciation: /ˌənˈbərTHdā


Any day except one’s birthday: [as modifier]: an unbirthday present
More example sentences
  • And Mrs Du Faur may have been the first and last person to celebrate ‘unbirthdays’.
  • They can draw money out of 401 plans and IRAs to celebrate their unbirthdays or prepare for their big 60th bashes.
  • Ahhh, but there are three hundred and sixty four unbirthdays!


1871: coined by Lewis Carroll in Through the Looking Glass.

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