unbirthday
un·birth·day/ʌnˈbɝθ.deɪ/noun
unbirthday is spelled U-N-B-I-R-T-H-D-A-Y: 10 letters and 3 syllables (un·birth·day). It appears about once in every 40 million words in written English, the 194,306th most frequent word form (wordfreq, 2021 data). As a noun, unbirthday means “A day that is not one's birthday but is celebrated as though it were” (English Wiktionary, September 2026). The plural of unbirthday is unbirthdays.
How many letters and syllables are in unbirthday?
| Letters | 10: U-N-B-I-R-T-H-D-A-Y |
|---|---|
| Syllables | 3: un·birth·day |
| In writing | about once in every 40 million words; the 194,306th most frequent word form |
| Wrong spellings searched | none measured in search |
| Rhymes with |
Sources: letters and syllables from the English Wiktionary's hyphenation or pronunciation; written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media); rhymes and same-letter words are computed by PlainSpell from its own word list.
How common is unbirthday?
Unbirthday appears about once in every 40 million words in written English, the 194,306th most frequent word form in the list.
Source: written frequency: wordfreq 3.1 (a 2021 snapshot of Wikipedia, subtitles, news, books, web text and social media).
How do you pronounce unbirthday?
- UK /ʌnˈbɜːθ.deɪ/
- US /ʌnˈbɝθ.deɪ/
Unbirthday has 3 syllables, split un·birth·day in writing.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Recordings: En-au-unbirthday.ogg, Wikimedia Commons (author and licence on each file's page).
What rhymes with unbirthday?
One word on PlainSpell end in the same sounds as unbirthday from its last stressed vowel (/ɜɹθdeɪ/):
Computed by PlainSpell from the pronunciations in the English Wiktionary (dump of September 2, 2026): a rhyme shares every sound from the last stressed vowel to the end; ordered by written frequency (wordfreq 3.1).
Forms of unbirthday
- unbirthdays plural
- un-birthday
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
What does unbirthday mean?
The meanings the English Wiktionary records, quoted as written there (source below).
noun
- 1
A day that is not one's birthday but is celebrated as though it were.
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).
Unbirthday in Spanish, French, German and Portuguese
In the sense Translations:
| Language | Words |
|---|---|
| French | non-anniversaire |
| German | Nichtgeburtstag |
| Portuguese | desaniversário |
| Spanish | no cumpleaños |
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract). Translations are Wiktionary's, by sense; a linked word has its own PlainSpell page.
Where does unbirthday come from?
From un- + birthday, coined by English writer Lewis Carroll (1832–1898) in Through the Looking-Glass (1871).
Source: English Wiktionary, dump of September 2, 2026 (CC BY-SA 4.0), through kaikki.org (Wiktextract).