Synonyms

When one tries to harm somebody in anyway as one feels the opponent as a threat

Its is the most suitable answer in the given context as the author intends to convey that the feelings of the said people went with them upto their graves.

It most nearly means lack of control owing to noise and public violence.

Onerous means burdensome, oppressive, or troublesome; causing hardship.

It means to overcome with fear; intimidate.

It means to abstain or keep away from; shun; avoid..

It means continuing without interruption; ceaseless.

Castigate means to criticize or reprimand severely.

Perjure is making a false statement under oath or solemn affirmation.

Rancid means having a rank, unpleasant, stale smell or taste, as through decomposition, especially of fats or oils.

It is a a great wave or surge of the sea.

It means bending readily; flexible; pliant. All the other options except 1 are opposite in meaning to limber.

It means to refuse or deny oneself (some rights, conveniences, etc.), reject; renounce.

Boorish means of or like a boor ; unmannered; crude; insensitive.

It means a cleansing with water or other liquid, especially as a religious ritual. Purge means to rid of whatever is impure or undesirable; cleanse or purify. So, option 4 is the correct answer.