painless
adj.adj. causing no physical pain or very little trouble. You use this to describe a medical treatment or a task that is surprisingly easy to finish.
adj. causing no physical discomfort or requiring little effort. Often used figuratively to describe a process or transition that occurs without difficulty or complication.
The dentist promised that the procedure would be painless.
Switching to the new software was a painless process that only took a few minutes for the whole team.
While the initial restructuring caused some anxiety among the staff, the actual implementation proved remarkably painless due to the management's transparent communication strategy.
From Middle English paynles, peynlees, equivalent to pain + -less. Compare West Frisian pynleas (“painless”), Dutch pijnloos (“painless”).
Can be used both attributively before a noun and predicatively after a linking verb like 'be' or 'seem'.