Thesaurus

closed book

noun

Synonyms of closed book

something hard to understand or explain
  • the couple's unorthodox marriage is definitely a closed book to those outside of the relationship

Synonyms for closed book

Words Related to closed book

See the Dictionary Definition 

Keep scrolling for more

Learn More about closed book

Time Traveler for closed book

Time Traveler

The first known use of closed book was in 1913

See more words from the same year

Cite this Entry

“Closed book.” Merriam-Webster.com Thesaurus, Merriam-Webster, https://www.merriam-webster.com/thesaurus/closed%20book. Accessed 29 May. 2020.

More from Merriam-Webster on closed book

Dictionary: Definition of closed book

Rhyming Dictionary: Words that rhyme with closed book

Comments on closed book

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

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

May 2020 Words of the Day Quiz

  • a blooming wisteria tree
  • Which is a synonym of exiguous?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Citation

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!