Synonyms of the word 
MEMORABLE → UNFORGETTABLE
memorable
- adj. Worthy to be remembered; very important or remarkable.
unforgettable
- adj. Very difficult or impossible to forget.
If you are interested in words, visit the following sites :
- wiktionary.org/memorable For complete definition of a word
- 1word.ws/memorable to play with words, suffixs, prefixs, etc.