Unflinching folks
I believe the answer is:
stoics
'unflinching folks' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for stoics that I've seen before include "They bear discomforts without complaining, like old Romans and Greeks" , "They endure pain unflinchingly" , "They bear discomforts without complaint, like ancient philosophers" .)