obdurate
Cross references:
1. inflexible
ob.du.rate \'a:b-d(y)*-r*t; a:b-'d(y)u.r-*t, *b-, 'a:b-.\ aj [ME, fr. L
obduratus, pp. of obdurare to harden, fr. ob- agai]nst + durus hard - more
at DURING 1a: hardened in feelings 1b: stubbornly persistent in wrongdoing
2: resistant to persuasion or softening influences : UNYIELDING -
ob.du.rate.ly av
Webster's English Dictionary