Sanguine means:
Sanguine means optimistic or positive.
Untenable means not defensible or unsustainable; the opposite is defensible.
Abstemious means moderate or restrained, especially in eating or drinking; the opposite is excessive.
Recalcitrant means stubbornly resistant to authority; defiant.
Implacable describes someone unable to be appeased or pacified, so “merciful” serves as the antonym, describing compassionate, forgiving behavior opposite to relentless harshness.
Impecunious means lacking money or being poor, making “affluent” the antonym, describing someone wealthy and financially prosperous rather than destitute or penniless.
Insipid describes something bland, dull, or lacking flavor and excitement, making “stimulating” the antonym, describing something engaging, exciting, and full of interest.
Intransigent describes stubborn refusal to compromise, making “flexible” the antonym, describing willingness to adapt, negotiate, and adjust one's position when circumstances require.
Profligate describes wasteful, extravagant spending, making “frugal” the antonym, describing careful, economical behavior that avoids unnecessary expenditure and conserves resources wisely.
An imbroglio refers to a confusing, complicated situation or misunderstanding, making “entanglement” the appropriate synonym describing a complex, difficult-to-resolve predicament or conflict.
Perspicacious describes someone having keen insight and mental clarity, making “perceptive” the closest synonym, both indicating sharp understanding and ability to notice subtle details.
Munificent describes extreme generosity in giving, making “magnanimous” the closest synonym, both conveying large-hearted, generous, and noble character traits in bestowing gifts or favors.
Obfuscate means to deliberately make something unclear or difficult to understand, making “confuse” the appropriate synonym describing the act of obscuring meaning intentionally.
“Whatever” combines “what” with “ever” to form a compound relative pronoun, introducing a clause and referring to an unspecified thing without needing an antecedent.
“The rich” uses the adjective “rich” functioning as a noun, referring collectively to wealthy people as a group, a common construction with “the” plus adjective.
“After” introduces a dependent clause showing time relationship between two clauses, functioning as a subordinating conjunction connecting the subordinate clause to the main clause.
“What” here functions as a relative pronoun introducing a noun clause, meaning “the thing that,” connecting the clause to the main sentence structure.
In “worked hard,” hard modifies the verb worked, making it an adverb; in “hard surface,” hard modifies the noun surface, making it an adjective.
“The then Prime Minister” uses “then” as an adjective modifying “Prime Minister,” specifying the person holding that position at that particular time.
“Walking” functions as a present participle forming a participial phrase describing the subject “she,” expressing an action occurring simultaneously with the main verb.