Synonyms of the word

enigma

• n. Something or someone puzzling, mysterious or inexplicable.
• n. A riddle, or a difficult problem.

brain-teaser

• n. A complex riddle or puzzle.

conundrum

• n. A difficult question or riddle, especially one using a play on words in the answer.
• n. A difficult choice or decision that must be made.

mystery

• n. Something secret or unexplainable; an unknown.
• n. Someone or something with an obscure or puzzling nature.
• n. (obsolete) A secret or mystical meaning.
• n. A religious truth not understandable by the application of human reason alone (without divine aid).
• n. (archaic outside Eastern Orthodoxy) A sacrament.
• n. (chiefly in the plural) A secret religious celebration, to which none were admitted except those who had…
• n. (Catholicism) A particular event or series of events in the life of Christ.
• n. A craft, art or trade; specifically a guild of craftsmen.

perplexity

• n. The state or quality of being perplexed; puzzled or confused.
• n. Something that perplexes.
• n. A measurement in information theory: see Perplexity.

problem

• n. A difficulty that has to be resolved or dealt with.
• n. A question to be answered, schoolwork exercise.
• n. A puzzling circumstance.
• adj. (of a person or an animal) Difficult to train or guide; unruly.
• adj. Causing a problem; problematic; troublesome.

riddle

• n. A verbal puzzle, mystery, or other problem of an intellectual nature.
• n. An ancient verbal, poetic, or literary form, in which, rather than a rhyme scheme, there are parallel…
• v. To speak ambiguously or enigmatically.
• v. (transitive) To solve, answer, or explicate a riddle or question.
• n. A sieve with coarse meshes, usually of wire, for separating coarser materials from finer, as chaff from…
• n. A board with a row of pins, set zigzag, between which wire is drawn to straighten it.
• v. To put something through a riddle or sieve, to sieve, to sift.
• v. To fill with holes like a riddle.
• v. To fill or spread throughout; to pervade.
• n. (obsolete) A curtain; bed-curtain.
• n. (religious) One of the pair of curtains enclosing an altar on the north and south.
• v. (transitive, obsolete) To plait.

secret

• n. (countable, uncountable) Knowledge that is hidden and intended to be kept hidden.
• n. (uncountable) Something not understood or known.
• n. (archaic, in the plural) The genital organs.
• adj. Being or kept hidden.
• adj. (obsolete) Withdrawn from general intercourse or notice; in retirement or secrecy; secluded.
• adj. (obsolete) Faithful to a secret; not inclined to divulge or betray confidence; secretive.
• adj. (obsolete) Separate; distinct.
• v. (transitive) To make or keep secret.
• v. (transitive) To hide secretly.