Antonyms

We would be identifying the word that is an antonym to the given word "Adherent" from the given options.
Adherent means sticking fast to an object or surface. The opposite would thus mean to draw away or divert i.e. detractor. 
If we look into the other words,
Rival means a person or thing competing with another for the same objective or for superiority in the same field of activity
Alien means belonging to a foreign country
Enemy means a person who is actively opposed or hostile to someone or something

Word 'Uneven' is a synonym of patchy while others are opposite in meaning from patchy.

Generous is correct as the word niggardly means ungenerous with money, time, etc.; mean while the word generous  means showing a readiness to give more of something, especially money, than is strictly necessary or expected.. Both the words are opposite in meaning.

Evasive adjective – Hard to find, capture, or isolate.
Honest is an antonym for evasive

Fraudulent is dishonest or an act done by deception.
So the opposite word is Genuine.

Dear : expensive.
Cheap : low in price, especially in relation to similar items or services.
Worthless : having no real value or use.
Free : able to act or be done as one wishes; not under the control of another.
Priceless : so precious that its value cannot be determined.
Antonym of Dear is Cheap.

The antonym of HIRSUTE is BALD.

The Antonym of Shrink is Expand.