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Definition of unbirthday

unbirthday

/ˌʌnˈbɜːrθ.deɪ/
un · birth · day
Plural:unbirthdays
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unbirthday Lexical Profile

unbirthday Game Scores & Validity

• noun

1

Any day of the year other than a person's birthday, especially when playfully celebrated with gifts or festivities.

Example

"The children hosted a whimsical tea party to celebrate their unbirthdays."

Antonyms
View all antonyms for unbirthday

• Rhymes for unbirthday

• Nearby Words

unbigoted
unbilled
unbind
unbirthday
unbitten
unbleached
unblemished

Word Origin & Etymology

Coined by Lewis Carroll in his 1871 novel 'Through the Looking-Glass', where Humpty Dumpty explains that a person has 364 days in a year when they might receive unbirthday presents, compared to only one for birthday presents.

Cite this Entry

Wordmom. (2026). Definition of Unbirthday. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/unbirthday
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