Synonyms of the word 
UNCONSCIENTIOUS → CONSCIENCELESS - UNCONSCIONABLE
unconscientious
- adj. Not conscientious.
conscienceless
- adj. Lacking a conscience; unscrupulous or ruthless.
unconscionable
- adj. Not conscionable; unscrupulous and lacking principles or conscience.
- adj. Excessive, imprudent or unreasonable.
If you are interested in words, visit the following sites :
- wiktionary.org/unconscientious For complete definition of a word
- 1word.ws/unconscientious to play with words, suffixs, prefixs, etc.