Synonyms

Desideratum refers to something that is lacking but desired as essential, or something considered necessary or highly desirable. The option correctly identifies it as something needed but missing.

Denizen means an inhabitant or occupant of a particular place, or someone who regularly lives in a specific location. 'Citizen' correctly captures this sense of belonging to a place.

Defalcate specifically means to embezzle or misappropriate funds, typically by someone in a position of trust. 'Embezzle' is the precise legal and financial term for this action.

Dirge is a song of mourning or lament, typically sung at a funeral. 'Song of mourning' directly and accurately captures this specific musical genre.

Disingenuous means lacking sincerity, often hiding one's true motives or pretending to be simpler or more innocent than one actually is. Calculating is the closest synonym because a calculating person acts in a shrewd, self-serving, and unforthcoming manner.

Deference means respectful submission or yielding to the judgment or opinion of another. 'Respect' accurately captures this core meaning of showing regard for someone else's position or authority.

Doldrums refers to a state of listlessness, stagnation, or low spirits. 'Stagnation' accurately captures this sense of inactivity and lack of progress or energy.

Synonym of Defile is befoul. Defile means to contaminate/violate. Befoul means to pollute/contaminate. So befoul is synonym of defile.

Deft means skillful, quick, or clever in movement or action. 'Apt' can mean suitable or quick to learn, which relates to skillfulness, though 'skillful' would be more precise. Among the options, 'apt' is the closest match.

 Enormous is similar in meaning to gargantuan.

Garish means showy, bright, elaborate, or ostentatious in a tasteless or crude way. Gaudy has the same meaning - both describe something that is overly colorful or flashy in an unrefined manner. This is the correct synonym.