Synonyms of the word 
UNPAINFUL → PAIN-FREE - PAINLESS
unpainful
- adj. Not painful.
pain-free
- adj. without pain, free of pain.
painless
- adj. Free from pain; without pain or trouble.
- adj. Not difficult; easy.
If you are interested in words, visit the following sites :
- wiktionary.org/unpainful For complete definition of a word
- 1word.ws/unpainful to play with words, suffixs, prefixs, etc.