Find the synonym that is most nearly similar in meaning to the word- 'Debacle'

Concept: A synonym is a word that shares the same core meaning as the target word. To pick the best synonym, first fix the precise meaning and connotation (positive or negative) of the given word, then match it to the option whose meaning and tone align most closely.

Application: 'Debacle' (from French débâcle, originally the violent breaking-up of river ice) means a sudden, complete and often humiliating collapse or failure — a fiasco, calamity or disaster. Its connotation is strongly negative. Among the options, 'catastrophe' likewise means a disastrous, ruinous failure or sudden ruin, so its meaning and negative tone match 'debacle' most closely.

The other three words carry unrelated senses:

• Dandy — a stylishly dressed man, or informally 'excellent'; an approving, complimentary term.

• Corker — informal for something strikingly excellent or remarkable; again admiring and positive.

• Opulence — great wealth, luxury or abundance; a word from the vocabulary of prosperity.

Cross-check: Standard thesauri list disaster, catastrophe, calamity and fiasco as synonyms of debacle, while words of excellence or wealth are not. Hence 'catastrophe' is the correct synonym.