Cambridge Dictionaries online Cambridge Dictionaries online

The most popular online dictionary and thesaurus for learners of English


English definition of “(as) tough as nails”

(as) tough as nails

(also (as) hard as nails)
strong and very determined: She is a warm and friendly person, but she is also as tough as nails at work.
(Definition of (as) tough as nails from the Cambridge Academic Content Dictionary © Cambridge University Press)

Word of the Day

work out

to exercise in order to improve the strength or appearance of your body

Word of the Day


Read our blog about how the English language behaves.

Learn More

New Words

Find words and meanings that have just started to be used in English, and let us know what you think of them.

Learn More