re·frac·to·ry adj \ri-ˈfrak-t(ə-)rē\
: resistant to treatment or cure <a refractory fulminant lesion> <had disease that was extremely refractory to multiple intensive therapies—Michelle L. Bennett et al>
: unresponsive to stimulus <the refractory period of a muscle fiber>
: resistant or not responding to an infectious agent : immune <refractory to reinfection>
Seen & Heard
What made you want to look up refractory? Please tell us where you read or heard it (including the quote, if possible).