I suffered more anxiety than most of my fellow-slaves. . . . Their backs had been made familiar with the bloody lash, so that they had become callous; mine was yet tender; for while at Baltimore I got few whippings. . . .

—Narrative of the Life of Frederick Douglass,
Frederick Douglass

Look for antonym context clues to help you determine the meaning of the word callous and then choose the meaning of callous from these choices.

unfeeling
bloody
sensitive
worry