Word.ws English Dictionary

unbirthday

Syllables: un·birth·dayUK/ʌnˈbɜːθ.deɪ/US/ʌnˈbɝθ.deɪ/

unbirthday noun: a day that is not one's birthday but is celebrated as though it were.

Noun

unbirthday (plural unbirthdays)

  1. A day that is not one's birthday but is celebrated as though it were.
    • "They gave it me," Humpty Dumpty continued thoughtfully, as he crossed one knee over the other and clasped his hands round it, "they gave it me⸺for an un-birthday present." / "I beg your pardon?" Alice said with a puzzled air." / "I'm not offended," said Humpty Dumpty. / "I mean, what is an...1871 December 27 (indicated as 1872), Lewis Carroll [pseudonym; Charles Lutwidge Dodgson], “Humpty Dumpty”, in Through the Looking-Glass, and What Alice Found There, London: Macmillan and Co., →OCLC...
    • Hunting for treasures on any special day (like Easter, Christmas, birthdays or unbirthdays) can be fun for children and parents alike.1995, Terry Orlick, Nice on My Feelings: Nurturing the Best in Children and Parents

Examples of unbirthday in a sentence

  • Another way to look at unbirthdays is as an opportunity to celebrate every day of life.1998, Alison Molinare Boteler, Matthew Klein, The Disney Party Handbook: 14 Fun Filled Parties:
  • Make an unbirthday cake and wear party hats when you blow out the candles together.2006, Sheila Ellison, 365 Games Smart Toddlers Play: Creative Time to Imagine, Grow and Learn:
  • I got some great photos with the unbirthday camera you left for me in the suitcase.2007, Lisa Samson, Quaker Summer:

Forms of unbirthday

pluralunbirthdays
alternative formun-birthday

Origin of unbirthday

From un- + birthday, coined by English writer Lewis Carroll (1832–1898) in Through the Looking-Glass (1871).

Questions about unbirthday

What does unbirthday mean?
Unbirthday means a day that is not one's birthday but is celebrated as though it were.
How do you use unbirthday in a sentence?
Another way to look at unbirthdays is as an opportunity to celebrate every day of life.
What part of speech is unbirthday?
Unbirthday is a noun.
How do you pronounce unbirthday?
Unbirthday is pronounced /ʌnˈbɜːθ.deɪ/ (UK).
What is the plural of unbirthday?
The plural of unbirthday is unbirthdays.

Words near unbirthday in the dictionary

  1. unbiquadium
  2. unbirched
  3. unbirdlike
  4. unbirdly
  5. unbirth
  6. unbirthday
  7. unbirthdays
  8. unbirthed
  9. unbirthing
  10. unbirthings
  11. unbirths

Source and license

Adapted from Wiktionary: unbirthday (page history and authors). Text available under the Creative Commons Attribution-ShareAlike 4.0 license. Word.ws reformatted the entry and added links. Wiktionary data of 2026-09-02.

Last updated:

Pronunciation audio from Wikimedia Commons, each file under its own free license: en-au-unbirthday.ogg.

Cite this entry: “unbirthday.” Word.ws, https://word.ws/unbirthday. Based on Wiktionary, CC BY-SA 4.0.