Meaning: Turpitude is a word that represents depraved or shameful behaviour.
Example:Prisons are filled with criminals who have engaged in acts of moral turpitude.
Synonyms: Baseness, Criminality, Degradation, Debauchery, Immorality
Antonyms: Decency, Honor, Goodness, Morality

Meaning: The ersatz version of something is an inferior substitute or imitation.
Serving as a substitute, synthetic, artificial
Example: You might speak in an ersatz French accent, but you cannot fool the officer.
Synonyms: Counterfeit, Fake, Imitation, Phony, Sham
Antonyms: Genuine, Real, True

Meaning: When you describe something as exigent, you are saying it requires attention: it can't be ignored.
Example: When circumstances become exigent, it's time to act.
You can also use exigent for a person who demands attention, usually by complaining.
Synonyms: Acute, Clamant, Necessary, Critical, Pressing
Antonyms: Easy, Ordinary, Facile, Usual

Meaning: Fervid can be used to describe something that is physically hot, it is more often used to describe heated emotions like anger, love, or desire.
Example: Example of fervid is boiling water; the water was fervid.
Synonyms: Ardent, Blazing, Passionate, Burning, Heated
Antonyms: Half-hearted, Passionless, Cold

Meaning: To impugn means to call into question or attack as wrong.
Example: No one can impugn the motives or the purity of his intentions.
Synonyms: Assail, Attack, Contravene, Criticize
Antonyms: Agree, Allow, Approve, Corroborate