be set in (one's) ways(redirected from is set in his ways)
be set in (one's) ways
To be inflexible or unwilling to change. Grandma will never retire—she's been a teacher for 50 years and is totally set in her ways. You'll never convince him to change, he's too set in his ways now.
set in one's ways, be
Be inflexible, fixed in one's habits, as in She's too set in her ways to go out and buy a dog. This idiom uses set in the sense of "in a rigid position," a usage dating from about 1300.
See also: set