keen as mustard

K

keen as mustard (simile)
/ˌkiːn əz ˈmʌstərd/

Meanings

• Very eager, enthusiastic, and ready to do something.
• Extremely interested in an activity, subject, or task.
• Highly motivated and energetic in pursuing a goal.
• Quick and willing to participate or help.

Synonyms: enthusiastic; eager; keen; eager-beaver; motivated; zealous; passionate; energetic; interested; willing.

Example Sentences

1. Emily was keen as mustard to begin her new job and arrived at the office an hour early.
2. The children were as keen as mustard to open their presents on Christmas morning.
3. Jack was keen as mustard about learning photography and spent every weekend practicing with his camera.
4. The young entrepreneur was keen as mustard to grow his business and worked tirelessly on new ideas.
5. When volunteers were needed for the community project, Sarah was keen as mustard and signed up immediately.

Etymology and Origin

The word “keen” has long carried senses of sharpness—whether for a blade, intellect, or appetite—while mustard brings its own history of pungency and heat. Mustard seeds mixed with liquids create a sharp, stimulating flavor that was thought to wake up the senses or even treat colds and fevers in older remedies. This natural bite likely inspired the comparison: just as mustard adds zest to a meal, a person “keen as mustard” brings lively energy to a task.

Origins and First Appearances

This phrase first emerged in England during the late 17th century. Its earliest known printed record comes from 1672 in a work by the English schoolmaster William Walker titled Phraseologia Anglo-Latina, or phrases of the English and Latin tongue; together with Paroemiologia Anglo-Latina. There, it simply appears as “As keen as mustard.”

A few years later, in 1679, F. Smith’s book Clod-pate’s Ghost used a similar idea and gave a clearer example of its meaning:

“You shall see a man as hot as Mustard against Plot and Plotters.”

These uses show the expression already conveying zeal and strong feeling.

Dispelling Common Myths

One popular belief links the idiom directly to a mustard manufacturer named Keen, whose company began in 1742 and became well-known for its products. However, the phrase predates the business by many decades, ruling out any connection to the brand. The expression grew naturally from mustard’s reputation rather than any commercial tie.

Cultural and Historical Context

Mustard held an important place in English cuisine, often paired with roast beef to add flavor and excitement to meals. This everyday association with zest and enthusiasm helped the phrase take root. Its medicinal reputation as a remedy further reinforced ideas of vitality and sharpness. The idiom spread steadily through literature and conversation, remaining a lively part of English speech into modern times.

Interesting Facts

An intriguing detail is that similar expressions like “hot as mustard” or “strong as mustard” appeared around the same period, all drawing on the condiment’s fiery nature. While the phrase enjoys steady use today, especially in Australia and Britain where it feels particularly at home.

Feeling, Food

Last update: May 31, 2026 2:07 AM