19 possible answers to
Answers with 3 characters: SET Answers with 5 characters: BALKY MULEY Answers with 6 characters: ORNERY CUSSED DOGGED MULISH WILFUL Answers with 7 characters: ADAMANT Answers with 8 characters: OBDURATE RENITENT Answers with 9 characters: HARDNOSED PIGHEADED OBSTINATE TENACIOUS Answers with 10 characters: HARDBITTEN HARDHEADED HEADSTRONG Answers with 11 characters: STIFFNECKED