bourru

surly; gruff

“Ce cloître bourru n'était pourtant pas si bien muré que la vie des passions du dehors, que le drame, que le roman même, n'y pénétrassent.” — This stern cloister was not so well walled off, however, but that the life of the passions of the outside world, drama, and even romance, did not make their way in.

From bourre + -u.