Find Antonyms

firstborn Antonyms

Opposite of firstborn

Because the opposite of firstborn shifts with each meaning, the antonyms and opposite words below are separated across 2 exact definitions and ranked by contrast strength.
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• adjective (Context 1)

First in the order of birth; eldest among a parent's children or offspring.

Usage Example

"Their lastborn son inherited the family estate in accordance with traditional custom."

Strongest
lastborn
youngest

• noun (Context 2)

The first child or offspring born to a parent or couple; the eldest child.

Usage Example

"As the lastborn in a large household, she often helped look after her younger siblings."

Strongest
lastborn

Similar words to firstborn

Words similar to firstborn shift depending on context. Common synonyms include:

eldest
oldest
primogenital
heir
See all synonyms of firstborn

• Nearby Words

firmly
firmness
first
firstborn
firstfruits
firsthand
firstly

Cite this Entry

Wordmom. (2026). Antonyms for Firstborn. In Wordmom Thesaurus. Retrieved Nov 5, 2026, from https://wordmom.com/antonyms/firstborn
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