Hard
Hard adjective - Sticking to an opinion, purpose, or course of action in spite of reason, arguments, or persuasion.
Usage example: a woman with a hard will who never budged from her chosen path
Iron is a synonym for hard in rocklike topic. In some cases you can use "Iron" instead the word "Hard" as an adjective or a noun.
Iron
Iron adjective - Not showing weakness or uncertainty.
Usage example: he had an iron determination to succeed in on Wall Street
Hard is a synonym for iron in characteristic topic. You can use "Hard" instead the word "Iron" as an adjective or a noun, if it concerns topics such as inflexible.
Mutual synonyms
Both words in one sentence
- Lawful Stupid middle brother Stannis is like iron; hard, inflexible, but brittle too.
Source: Metallic Motifs - Now with extra iron: it's hard to find a modern adaptation of the Marvel superhero Iron Man that doesn't include the guitar riff from the similarly-named Black Sabbath song.
Source: Isn't It Ironic? -
Made of Iron/Hard Head: His skull, chin and neck were hard as steel.
Source: Wrestling / Kazuyuki Fujita
Cite this Source
Iron and Hard. (2016). Retrieved 2026, August 08, from https://thesaurus.plus/related/hard/iron
Hard & Iron. N.p., 2016. Web. 08 Aug. 2026. <https://thesaurus.plus/related/hard/iron>.
Iron or Hard. 2016. Accessed August 08, 2026. https://thesaurus.plus/related/hard/iron.
Google Ngram Viewer shows how "hard" and "iron" have occurred on timeline