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A Hard Nut to Crack: Puzzling People and Problems

Summarize briefly with “in a nutshell” and describe people or problems that are difficult to understand.

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Words and Their Stories · 5:10

Audio lesson

Source: VOA Learning English · Words and Their Stories

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The episode connects a nut’s hard shell with two expressions. “In a nutshell” introduces a concise summary, while “a hard nut to crack” describes a person, problem, or situation that is difficult to understand, solve, or deal with. It also mentions the phrase “a riddle wrapped in a mystery inside an enigma” as a vivid description of something exceptionally hard to figure out.

Cultural note: “A hard nut to crack” can describe a challenging problem, but when used about a person it may sound judgmental. This phrase differs from “using a sledgehammer to crack a nut,” which criticizes a solution that is much too forceful or complicated for a small problem.

Keep exploringA short summary can make a complicated story clearer, even when the full mystery remains unsolved. What would you explain in a nutshell?

Phrase guide · 3 expressions

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Original explanations and examples, created for learners. Save a card for later or hear the phrase spoken by your browser.

Giving the short version

Introduce the essential point without every detail.

in a nutshell

Meaning

In a very brief statement that includes the most important information.

Tone & use

Often introduces a summary. It is informal, so choose “in summary” in formal writing.

Example

“In a nutshell, the proposal saves time but requires more staff at the beginning.”

NeutralInformal / idiomatic

Something difficult to figure out

Describe a puzzling person, problem, or situation.

a hard nut to crack

Meaning

A person, question, or situation that is difficult to understand, solve, or deal with.

Tone & use

Informal. Applied to a person, it can imply they are puzzling or hard to work with, so use care in direct conversation.

Example

“The final riddle was a hard nut to crack, even for the puzzle team.”

NeutralInformal / idiomatic

Describing a mystery

Use vivid language for something difficult to predict or explain.

a riddle wrapped in a mystery

Meaning

Something unusually difficult to understand or predict.

Tone & use

A dramatic, literary allusion. Use it for an especially confusing subject, not an ordinary small question.

Example

“The old map’s symbols were a riddle wrapped in a mystery to the new archivist.”

NeutralLiterary / dramatic

Knowledge check

Try it

Choose the expression that best fits each situation.

Try it · Choose the best expression

1 of 3

A report is too long, so you state its central point in two sentences. How might you introduce the summary?