Definition of unbirthday in English:

unbirthday

Syllabification: un·birth·day
Pronunciation: /ˌənˈbərTHˌdā
 
/

noun

humorous
  • 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!

Origin

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

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Word of the day grotesquerie
Pronunciation: grōˈteskərē
noun
grotesque quality or grotesque things collectively