contentious

As a noun favor

is a kind or helpful deed; an instance of voluntarily assisting (someone).

As a verb favor

is (transitive)  to look upon fondly; to prefer.

As an adjective contentious is

marked by heated arguments or controversy.

As adjectives the difference between competitive and contentious

is that competitive is capable of competing successfully while contentious is marked by heated arguments or controversy.

As adjectives the difference between contentious and antagonistic

is that contentious is marked by heated arguments or controversy while antagonistic is contending or acting against; as, antagonistic forces.

As adjectives the difference between adverse and contentious

is that adverse is unfavorable; antagonistic in purpose or effect; hostile; actively opposing one's interests or wishes; contrary to one's welfare; acting against; working in an opposing direction while contentious is marked by heated arguments or controversy.

As adjectives the difference between contentious and accepted

is that contentious is marked by heated arguments or controversy while accepted is generally approved, believed, or recognized.

As a verb accepted is

(accept).

As adjectives the difference between acrimonious and contentious

is that acrimonious is angry, acid, and sharp in delivering argumentative replies: bitter; mean-spirited; sharp in language or tone while contentious is marked by heated arguments or controversy.

As a noun antagonist

is antagonist (all senses).

As an adjective contentious is

marked by heated arguments or controversy.

As a verb impugn

is (obsolete) to assault, attack.

As an adjective contentious is

marked by heated arguments or controversy.

As a noun induction

is an act of inducting.

As an adjective contentious is

marked by heated arguments or controversy.

Contentious is a synonym of wrangling.

As an adjective contentious

is marked by heated arguments or controversy.

As a noun wrangling is

contention; gainstriving.

As a verb wrangling is

.