Synonyms of enigma

enigma

noun

i-ˈnig-mə 

as in mystery

something hard to understand or explain

how Thomas Jefferson could be both a slaveholder and a champion of liberty remains an enigma

Synonyms & Similar Words

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

Synonym Chooser

How does the noun enigma differ from other similar words?

Some common synonyms of enigma are mystery, problem, puzzle, and riddle. While all these words mean "something which baffles or perplexes," enigma applies to utterance or behavior that is very difficult to interpret.

his suicide remains an enigma

When would mystery be a good substitute for enigma?

The words mystery and enigma can be used in similar contexts, but 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

When is it sensible to use problem instead of enigma?

In some situations, the words problem and enigma are roughly equivalent. However, problem applies to a question or difficulty calling for a solution or causing concern.

problems created by high technology

Where would puzzle be a reasonable alternative to enigma?

The words puzzle and enigma are synonyms, but do differ in nuance. Specifically, 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 riddle a more appropriate choice than enigma?

The meanings of riddle and enigma largely overlap; however, riddle suggests an enigma or problem involving paradox or apparent contradiction.

the riddle of the reclusive pop star

Example Sentences

Recent Examples of enigma

In this documentary about the affair that led to her birth, Polley incorporates home movie footage — some authentic, some staged — and interviews with different family members to plumb the depths of a woman who remains, even to those who knew her, something of an enigma. —Eric Farwell, Entertainment Weekly, 21 Feb. 2026

Speaking of enigmas, Katie Zelem plays for West Ham now on loan after less than five months with London City. —Megan Feringa, New York Times, 4 Feb. 2026

Yet despite their impressive size, encounters with these enigmas remain exceedingly rare due to the myriad of challenges of studying deep-sea sharks. —Melissa Cristina Márquez, Forbes.com, 29 Jan. 2026

What adds another layer of enigma is that when sleeping, animals become less aware of their surroundings and more vulnerable to predators. —New Atlas, 24 Jan. 2026

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