1. IMMUTABLE (ADJECTIVE): not changing or unable to be changed

Synonyms: sacrosanct, stable

Antonyms: flexible, mutable

Example Sentence: Some people regard grammar as an immutable set of rules.

  1. INEXPLICABLE (ADJECTIVE): beyond comprehension, explanation

Synonyms: incomprehensible, mysterious

Antonyms: explainable, understandable

Example Sentence: What happened was so savage, and so inexplicable, that it never let her go.

  1. MENDACIOUS (ADJECTIVE): having a lying, false character

Synonyms: dishonest, deceitful

Antonyms: truthful, sincere

Example Sentence: The mendacious content of the magazines is at times entertaining.

  1. PENURIOUS (ADJECTIVE): miserly, avaricious

Synonyms: close- fisted, stingy

Antonyms: spendthrift, lavish

Example Sentence: She complained that her husband’s penurious ways made it impossible to live the lifestyle she felt she deserved.

  1. REPLETE (ADJECTIVE): full, abundant

Synonyms: loaded, well-stocked

Antonyms: lacking, needy

Example Sentence: The store was replete with fresh fruits.

  1. MULL (VERB): think about (something) deeply and at length.

Synonyms: examine, ponder

Antonyms: disregard, ignore

Example Sentence: A lot of us mull over taking the right kind of insurance that really serves our needs.

  1. SPRUCE (VERB): make someone or something smarter or tidier

Synonyms: polish, enhance

Antonyms: degrade, tarnish

Example Sentence: The fund will be used to spruce up the city.

  1. JUBILANT (ADJECTIVE): extremely joyful, happy

Synonyms: euphoric, exuberant

Antonyms: depressed, sorrowful

Example Sentence: The crowd was jubilant when P.V Sandhu won silver medal at Rio Olympics.

9.EXIGENT (ADJECTIVE): urgent, critical

Synonyms: crucial, acute

Antonyms: easy, facile

Example Sentence: The patient has an exigent need for medication, or else he will lose his sight.

  1. FERAL (ADJECTIVE): wild, savage

Synonyms: ferocious, brutal

Antonyms: domesticated, cultivated

Example Sentence: That cat looks so feral that one fears going near to it.