painless
1. [ adjective ] requiring little hard work or exertion
Examples:

"a painless solution to the problem"

Related terms: easy
2. [ adjective ] not causing physical or psychological pain
Examples:

"painless dentistry"

Related terms: painful pain-free harmless
3. [ adjective ] with as little pain as possible
Examples:

"a humanely painless killing"

Related terms: humane
Similar spelling:   painlessly
  panelist
  panellist