Indolent

Indolent (pronounced in-dl-uhnt)

(1) Having or showing a disposition to avoid exertion; slothful; disliking work or effort; lazy; idle.

(2) In pathology, causing little or no pain; inactive or relatively benign.

(3) In medicine (applied especially to painless ulcers), slow to heal.

1663: From either the French indolent or directly from the Medieval Latin indolentem, from the Latin indolent- (stem of indolēns), the construct being in- (not) + dolent- (stem of dolēns (pain)), present participle of dolēre (to be painful, be in pain) from dolēre (to grieve, to cause distress).  The sense of "living easily, slothful”, dates from 1710, a sense said (certainly by English etymologists) perhaps developed in French.  The synonyms for both meanings are many, typically words like slow, inactive, sluggish & torpid. 

The meanings related to medical matters are now entirely technical and restricted to the profession, both generalized as “a slowly progressive medical condition associated with little or no pain” and specifically in conditions such as lowest of three grades of non-Hodgkin's lymphoma (NHL), refractory corneal ulcers and a slow-growing carditis, a form of infective endocarditis that may also indicate rheumatic fever.  In general use, the word is now used exclusively to indicate degrees of idleness.  Indolent is an adjective (the occasional use as a noun remains non-standard), indolence is the noun, indolently the adverb.

An indolent Lindsay Lohan, Los Angeles, 2012.