Vocabulary: incumbent, quietus, plummet, flout, precarious, paucity, convene, mire, kith and kin, inculcate

1) incumbent (adjective)
Synonyms: official

Meaning: to be someone’s duty or responsibility to do something

Vocabulary: brazen, furore, sycophant, mala fide, shroud, tiff, en masse

1) brazen (adjective)
Synonyms: brassy - impudent - shameless - barefaced - impertinent

Meaning: behaving in a way that is not moral or socially acceptable, and not caring if other people are shocked or offended

Vocabulary: perjure, intransigence, fraught, amnesty, flounder, abut, depose

1) perjure (verb)
Synonyms: forswear

Meaning: willfully tell an untruth when giving evidence to a court

Sentence: It is necessary for the court to proceed against those who had perjured themselves.

Vocabulary: perennial, adjudicate, burgeoning, interred, encomium, subvert

1) perennial (adjective)
Synonyms: perpetual - everlasting - eternal - permanent

Meaning: always existing, or never seeming to change

Sentence: For people living on the outskirts of city the scarcity of water has been a perennial problem.

Vocabulary: unrelenting, beleaguered, rile, melee, inundate, incessant

1) unrelenting (adjective)
Synonyms: inexorable - relentless - merciless - implacable

Meaning: used about people’s actions or feelings

Sentence: Sonia Gandhi forcefully defended the PM against the unrelenting criticism he has been facing recently.

Vocabulary: besiege, ostensibly, lackadaisical, reining, erring

1) Besiege (verb)
Synonyms: beleaguer - beset - surround - invest - encircle   

Meaning: to make more requests, offers, comments, or complaints than someone can deal with