Merriam-Webster Logo
SINCE 1828
Menu
dictionary thesaurus

unbrother

transitive verb
un·​brother | \ ¦ən+\

Definition of unbrother

: to deprive of the status of brother

Love words?

You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.

Start your free trial today and get unlimited access to America's largest dictionary, with:

  • More than 250,000 words that aren't in our free dictionary
  • Expanded definitions, etymologies, and usage notes
  • Advanced search features
  • Ad free!

History and Etymology for unbrother

un- entry 2 + brother

Keep scrolling for more

Learn More about unbrother

Statistics for unbrother

Look-up Popularity

Comments on unbrother

What made you want to look up unbrother? Please tell us where you read or heard it (including the quote, if possible).

Show Comments  Hide Comments 

WORD OF THE DAY

insuperable

Listen to the pronounciation of insuperable

incapable of being surmounted or overcome

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Name That Thing

Test your visual vocabulary with our 10-question challenge!

TAKE THE QUIZ
Word Winder's CrossWinder

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!

Words at Play
Ask the Editors
Word Games