inflexible vs hardline

inflexible and hardline both are adjectives.

Word	Noun	Adjective	Verb	Adverb
inflexible	No	Yes	No	No
hardline	No	Yes	No	No

inflexible (adjective)	hardline (adjective)
resistant to being bent	firm and uncompromising
incapable of change
not making concessions
incapable of adapting or changing to meet circumstances