noun
Synonyms: mystery , Chinese puzzle, closed book, conundrum, mystification, puzzle, puzzlement, riddle, why
Related Word: crux, knot, puzzler, sticker; bewilderment, perplexity, question, question mark
Idioms: hard nut to crack
noun
Synonyms: mystery , Chinese puzzle, closed book, conundrum, mystification, puzzle, puzzlement, riddle, why
Related Word: crux, knot, puzzler, sticker; bewilderment, perplexity, question, question mark
Idioms: hard nut to crack
Merriam Webster. Collegiate thesaurus English vocabulary. Английский энциклопедический словарь тезаурус. 2003