Synonyms of mystery

mystery

noun

ˈmi-st(ə-)rē 

as in enigma

something hard to understand or explain

why my sister married that guy is still a mystery to my parents

Synonyms & Similar Words

• enigma
• puzzle
• riddle
• secret
• problem
• conundrum
• matter
• challenge
• why
• mystification
• puzzlement
• closed book
• head-scratcher
• perplexity
• case
• trouble
• poser
• brainteaser
• stumper
• knot

Synonym Chooser

How does the noun mystery differ from other similar words?

Some common synonyms of mystery are enigma, problem, puzzle, and riddle. While all these words mean "something which baffles or perplexes," mystery applies to what cannot be fully understood by reason or less strictly to whatever resists or defies explanation.

the mystery of the stone monoliths

Where would enigma be a reasonable alternative to mystery?

While the synonyms enigma and mystery are close in meaning, enigma applies to utterance or behavior that is very difficult to interpret.

his suicide remains an enigma

When might problem be a better fit than mystery?

The words problem and mystery can be used in similar contexts, but problem applies to a question or difficulty calling for a solution or causing concern.

problems created by high technology

When is puzzle a more appropriate choice than mystery?

The synonyms puzzle and mystery are sometimes interchangeable, but puzzle applies to an enigma or problem that challenges ingenuity for its solution.

the thief's motives were a puzzle for the police

When is it sensible to use riddle instead of mystery?

Although the words riddle and mystery have much in common, riddle suggests an enigma or problem involving paradox or apparent contradiction.

the riddle of the reclusive pop star

Example Sentences

Recent Examples of mystery

How Flor made her way from the north side of Chicago all the way to Gary remains a mystery, but Ratkowski said the reunion is a good reminder of why to always microchip your pet. — Claire Murphy, Chicago Tribune, 28 Aug. 2026

Roman’s job is to unlock the mysteries of dark energy while also planet hunting outside our solar system. — Richard Tribou, The Orlando Sentinel, 28 Aug. 2026

Switzerland imagines Highsmith as a recluse in the Alps, closely guarding a cache of weapons and secrets after a lifetime spent writing mysteries. — Brittany Allen, Literary Hub, 28 Aug. 2026

To now bring fans a brand-new mystery from that world is quite simply beyond my wildest dreams. — Rick Porter, HollywoodReporter, 28 Aug. 2026