Synonyms for cast-iron
- adjective
Most common
bullet-proof robust impervious unshakable US stern iron-clad
Synonyms by meaning
Adjective
1. Iron — durable; tough; resilient
iron, bullet-proof, robust, impervious, unshakable US, unshakeable UK
2. Iron-clad — inflexible or without exception
Definitions
- adj. 1
Durable; tough; resilient.
Ernest has a cast iron constitution and never gets sick.
- adj. 2
Inflexible or without exception.
The school's cast iron policy on admissions fees left no leeway for needy students.
Related words
- Phrases
- cast-iron plant
- Is a kind of
- iron metal
- Other spellings
- cast iron castiron
Example sentences
- robust The software is extremely robust and full-featured.
- impervious Mark almost became impervious to toxic co-workers.
- unshakable Mary was irritated by Tom's unshakable calmness.
- stern Oleg ordered Rima to return to bed in a stern tone.
By length
- 4 letters
- iron2
- 5 letters
- stern1
- 6 letters
- robust2
- 10 letters
- unwavering4, impervious4, unshakable4
- 11 letters
- unrelenting4, unshakeable4
The small number after each word is its number of syllables (iron2 = 2 syllables).