Synonyms of the word 
UNDECLARED → UNACKNOWLEDGED - UNAVOWED
undeclared
- adj. Not declared.
unacknowledged
- adj. Not acknowledged.
unavowed
- adj. Not avowed.
If you are interested in words, visit the following sites :
- wiktionary.org/undeclared For complete definition of a word
- 1word.ws/undeclared to play with words, suffixs, prefixs, etc.