painless
adjective /ˈpeɪnləs/
  /ˈpeɪnləs/
 - causing you no pain- a painless death
- The treatment is painless.
 Oxford Collocations Dictionaryverbs- be
 - completely
- totally
- fairly
- …
 
- not unpleasant or difficult to do- The interview was relatively painless.
 Oxford Collocations Dictionaryverbs- be
 - completely
- totally
- fairly
- …