obstinant

As adjectives the difference between obstinant and obdurate

is that obstinant is (proscribed) obstinate while obdurate is stubbornly persistent, generally in wrongdoing; refusing to reform or repent.

As adjectives the difference between obstinant and fickle

is that obstinant is (proscribed) obstinate while fickle is quick to change one’s opinion or allegiance; insincere; not loyal or reliable.

As a verb fickle is

to deceive; flatter.

As an adjective obstinant

is (proscribed) obstinate.

As a noun abstinent is

(usually|capitalized|religion|historical) one of a sect who appeared in france and spain in the 3rd century, and believed in abstinence towards meat and sex.

As adjectives the difference between obstinant and undefined

is that obstinant is (proscribed) obstinate while undefined is lacking a definition or value.

As adjectives the difference between obstinate and obstinant

is that obstinate is stubbornly adhering to an opinion, purpose, or course, usually with implied unreasonableness; persistent while obstinant is obstinate.

As adjectives the difference between stubborn and obstinant

is that stubborn is refusing to move or to change one's opinion; obstinate; firmly resisting while obstinant is (proscribed) obstinate.