Find Antonyms

sister Antonyms

Opposite of sister

Because the opposite of sister shifts with each meaning, the 14 antonyms and opposite words below are separated across 6 exact definitions and ranked by contrast strength.
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• noun (Context 1)

A woman or girl in relation to other daughters and sons of her parents; a female sibling.

Usage Example

"My older brother is studying architecture at the state university."

Strongest
brother

• noun (Context 2)

A female fellow member of a group, association, labor union, or shared identity, or a close female friend.

Usage Example

"She stood in solidarity with her union sisters during the contract negotiations."

Strong
outsider
stranger
rival
enemy

• adjective (Context 3)

Related, allied, or paired by shared origins, characteristics, or affiliation (used only before a noun, as in sister company or sister city).

Usage Example

"Our municipality recently signed a cultural exchange agreement with its unaffiliated city in Japan."

Strongest
unaffiliated
unrelated
Strong
independent
rival

• noun (Context 4)

A female member of a religious order, especially a Roman Catholic nun; also used as a title of address.

Usage Example

"The sisters at the local convent operate a community food pantry and clinic."

Strongest
monk
Strong
friar
brother
laywoman

• verb (Context 5)

To strengthen or reinforce a structural beam or joist by fastening a second piece of timber or metal alongside it (in carpentry and construction).

Usage Example

"The contractor had to weaken the sagging floor joists before laying the new hardwood."

Strong
weaken

• verb (Context 6)

To act as a sister toward someone, or to pair with another entity as a sister organization or city.

Usage Example

"Our town voted to dissociate with a coastal village in Portugal to promote educational exchanges."

Strong
dissociate
separate

Similar words to sister

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

nun
twin
sis
charge nurse
head nurse
companion
reinforce
partner
See all synonyms of sister

Cite this Entry


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