ETYM Pref. in- not + Latin dolens, -entis, p. pr. of dolere to feel pain: cf. French indolent. Related to Dolorous.
(Pathology) Of tumors e.g.; slow to heal or develop and usually painless.

1. Not causing physical or psychological pain.
2. Requiring little hard work or exertion.
3. With as little pain as possible.