in-, not, non, -dol, sad, sorrowful, 語源的にはcondole, dolefulと同じ。つまり、悲しみのない、苦痛に耐える必要がない、努力する必要がない、怠惰な、という意味の後世の派生語。
英語の語源
indolent
indolent: [18] Historically, indolent means ‘feeling no pain’ – indeed, that is how it was used as a technical medical term in English in the 17th and 18th centuries. It comes from late Latin indolens, which was based on the Latin verb dolere ‘suffer pain’ (source also of English dolour [13] and doleful [13]). English took the term directly from Latin, but meanwhile in French indolent had broadened out in meaning via ‘insensitive’ to ‘inactive, lethargic, lazy’, and that is the basis of the current English use of the adjective, acquired in the early 18th century. => doleful, dolour
indolent (adj.)
1660s, "painless," from Late Latin indolentem (see indolence). Sense of "living easily" is 1710, from French indolent. Related: Indolently.
例文
1. He is old and fat and indolent .
彼は年を取って太っていて怠惰だ。
2.The sultry weather in the tropis encourages tourists to lead an indolent life.
熱帯の蒸し暑い気候は観光客をだらだらとした生活しか送ることができない。
3.I don 't want to make friends with indolent persons.
私は怠け者と友達になるのが好きではありません。
4.You 're too fastidious，and too indolent ，and too rich.