The closest synonym for the word "contentions" would be "disputes" or "arguments" as it refers to conflicts or disagreements between people.
The closest synonym for the word "believed" is "trusted" or "accepted."
The closest synonym for the word controversy is "dispute" or "debate."
A synonym for the word doctrine is belief or principle.
A synonym that has a meaning similar to the word believes is the word trust. An antonym to the word believes that has an opposite meaning of it is the word doubt.
In this sentence, the best synonym for "perspicacious" would be "perceptive" as it conveys the idea of keen insight and understanding.
The closest synonym to the word visible would be 'in view'.
The closest synonym for equipped would be armed.
the correct synonym for the word maintaining is Preserving.
I think "recommended" would be the closest.
stop
challenging
guaranteed
Foresee
Significant.
impending
Particulars
discusted