impervious to pleas, persuasion, requests, reason;
Determined
very hard native crystalline carbon valued as a gem
HARDNOSED
IRON
extremely robust; "an iron constitution"
home appliance consisting of a flat metal base that is heated and used to smooth cloth
a golf club that has a relatively narrow metal head
implement used to brand live stock
a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood
press and smooth with a heated iron; "press your shirts"; "she stood there ironing"
OBDURATE
showing unfeeling resistance to tender feelings; "his flinty gaze"; "the child's misery would move even the most obdurate heart"
stubbornly persistent in wrongdoing
OBSTINATE
resistant to guidance or discipline; "Mary Mary quite contrary"; "an obstinate child with a violent temper"; "a perverse mood"; "wayward behavior"
stubbornly persistent in wrongdoing
tenaciously unwilling or marked by tenacious unwillingness to yield
Stupid
Stupid stubborn
persist stubbornly; "he obstinates himself against all rational arguments"
RIGID
incapable of or resistant to bending;
designating an airship or dirigible having a form maintained by a stiff unyielding frame or structure
incapable of adapting or changing to meet circumstances;
fixed and unmoving; "with eyes set in a fixed glassy stare";
incapable of compromise or flexibility
Stiff
UNBENDING
release from mental strain, tension, or formality; "unbend the mind from absorbing too much information"
become less tense, rest, or take one's ease; "He relaxed in the hot tub"; "Let's all relax after a hard day's work"
make less taut; "relax the tension on the rope"
free from flexure; "unbend a bow"
unfasten, as a sail, from a spar or a stay
straighten up or out; make straight
incapable of adapting or changing to meet circumstances;