Closed book meaning in hindi

How to pronounce Closed book
As noun :
अपरिचित विषय
Examples
Closed book synonyms
enigma puzzlement poser mystification problem why brain-teaser subtlety question secrecy stickler cliffhanger twister occult cryptogram crux difficulty charade oracle sixty-four-thousand-dollar question thriller stumper abstruseness grabber whodunit chiller inscrutability sphinx rune rebus brainteaser braintwister inscrutableness mindboggler tough nut to crack dilemma quandary complexity strait plight complication doubt maze labyrinth confusion embarrassment entanglement distraction predicament bewilderment intricacy brain-twister knotty question mind-boggler sixty-four dollar question tough proposition
Closed book antonyms
known understanding simplicity solution good fortune confidence harmony
Usage of Closed book in sentences

The word is used as noun in english grammar. The word can be used as noun in hindi 
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