closed book (Meaning)

Wordnet

closed book (n)

something that baffles understanding and cannot be explained

Despite his efforts, her thoughts remained a closed book to him.
The topic of quantum physics was a closed book to most of the class.
He was like a closed book, never revealing much about his personal life.
Her feelings towards him were a closed book, leaving him unsure of where he stood.
The history of the ancient civilization was a closed book until the recent archaeological discoveries.
The new software was a closed book to him until he attended the training session.
The intricate workings of the human brain were a closed book to even the most knowledgeable scientists.
The mystery surrounding the disappearance of the famous explorer remained a closed book for decades.
She kept her emotions tightly guarded, like a closed book with no pages to turn.
Despite his best efforts, understanding her motivations was a closed book that he couldn't decipher.

something that baffles understanding and cannot be explained

mystery, enigma, why,puzzle, secret, head-scratcher, challenge, conundrum, problem, riddle

No antonyms found.

Despite his efforts, her thoughts remained a closed book to him.

The topic of quantum physics was a closed book to most of the class.

He was like a closed book, never revealing much about his personal life.

Her feelings towards him were a closed book, leaving him unsure of where he stood.