unbreakablecode
nounUK /ʌnˈbreɪkəbl kəʊd/
US /ʌnˈbreɪkəbl koʊd/
A secret code that is so strong nobody can figure it out.
The spies used an unbreakablecode to keep their messages safe.
RELATED WORDS
OTHER MEANINGS
2. A piece of computer code that never crashes or fails.
The engineer wrote an unbreakablecode that ran for years without errors.
3. A rule or promise that can never be changed or broken.
Their friendship was like an unbreakablecode they both followed.
4. A puzzle or riddle that is impossible to solve.
The treasure map's unbreakablecode kept everyone guessing for days.