Indolent : not liking to work or be active
http://www.merriam-webster.com/dictionary/indolent
Used in “Beloved” on page 121 in the second paragraph
Where she was once indolent, resentful of every task, now she is spry, executing, even extending the assignments Sethe leaves for them.
The word in the sentence is describing how she once felt lazy and unmotivated to do work.
