Synonyms of the word 
PAINSTAKINGNESS → CAREFULNESS - CONSCIENTIOUSNESS
painstakingness
- n. The state or characteristic of being painstaking; the giving of careful attention to details.
carefulness
- n. The state of being careful.
conscientiousness
- n. The state or characteristic of being conscientious.
If you are interested in words, visit the following sites :
- wiktionary.org/painstakingness For complete definition of a word
- 1word.ws/painstakingness to play with words, suffixs, prefixs, etc.