Antonyms

 Admonition means to caution/ condemn. So opposite is to praise/permit.

 Somthing that is repugnant is loathsome or hated. Love is the opposite of this. 

Assuaged means to satisfy, hence unsatisified is correct.

Eschew means avoid / keep away from.
Therefore, "Welcome" meaning invite is the opposite of Eschew.

Pandemonium means wild and noisy disorder or confusion. Calm is the direct opposite, representing peace and order.

Proclivity means a tendency or inclination to do something. Aversion is the opposite, meaning a strong dislike or disinclination.

Ductility is the quality of being easily shaped or bent without breaking. Brittleness is the opposite, meaning the quality of being hard but liable to break or shatter easily.

Egress refers to the action of going out or leaving a place. Entrance is the direct opposite, referring to the action of entering.

Gelid means extremely cold or icy. Warm is the logical opposite.

Mettle refers to a person's ability to cope well with difficulties or to face a demanding situation in a spirited and resilient way. Trepidation, meaning fear or agitation, is the opposite of this courage.

Sessile describes an organism that is fixed in one place and immobile. Mobile is the direct opposite.

 Mutability refers to the abiltiy to change, whereas tenacity refers to the tendency to stand firm and unbending. Hence, option 4 is correct. 

Virile refers to having strength, energy, and a strong sex drive, often associated with traditional masculinity. Effeminate is the antonym, describing traits traditionally associated with women.

Turbid means cloudy, opaque, or thick with suspended matter. Limpid means clear, transparent, or pellucid, making it the correct antonym.

Indigenous means originating or occurring naturally in a particular place. Alien means belonging to a foreign country or people, serving as the opposite.

Obdurate means stubbornly refusing to change one's opinion or course of action. Yielding means giving way to arguments or pressure, which is the opposite.

Obtuse means annoyingly insensitive or slow to understand. Shrewd means having or showing sharp powers of judgment, which is the opposite.

A tyro is a beginner or a novice. An expert is someone who has mastered a subject, making it the opposite.

Unanimity means agreement by all people involved. Discord means disagreement or lack of harmony, which is the opposite.

Gregarious means fond of company and sociable. Antisocial means avoiding the company of others, which is the opposite.

'Supercilious' means 'haughtily disdainful or contemptuous.

 'Fecund' means 'very productive or creative intellectually'. So, 'unable to produce' is the opposite of fecund.

'Disperse' means 'to spread widely or disseminate'. 
'Gather up' is the opposite of disperse.

'Oblivious' means 'forgetful, without remembrance or memory or unaware'.
Active means aware and in action. It is the opposite of oblivious.

 'Acceptance' means 'taking something that is offered'.