English → French
obstinate /BrE ˈɒbstɪnət 
, AmE ˈɑbstənət /
adjective
[person] obstiné, têtu (about en ce qui concerne); [behaviour, silence, effort] obstiné; [resistance] acharné; [illness, cough] persistant; [fever, stain] rebelle
he's being most obstinate about it il n'en démord pas