uncrackablecipher
nounUK /ʌnˈkrækəbəl ˈsaɪfə/
US /ʌnˈkrækəbəl ˈsaɪfər/
A secret code that nobody can figure out.
The spy wrote the message in an uncrackablecipher so no one could read it.
RELATED WORDS
OTHER MEANINGS
2. A puzzle or riddle that is too hard to solve.
The treasure map was an uncrackablecipher for the young explorers.
3. A password or lock that cannot be opened by guessing.
Her diary had an uncrackablecipher that kept her secrets safe.
4. A confusing set of words or symbols that makes no sense.
The doctor's handwriting looked like an uncrackablecipher.