A recalcitrant problem.
An example of recalcitrant is a student who constantly defies the teacher in class.
Origin of recalcitrant
- Late Latin recalcitrāns recalcitrant- present participle of recalcitrāre to be disobedient from Latin to deny access re- re- calcitrāre to kick (from calx calc- heel)
From American Heritage Dictionary of the English Language, 5th Edition
- From Latin recalcitrāns, recalcitrantis, present participle of recalcitrō, recalcitrāre (“be disobedient").