Step 1: Understanding the Concept:
``INSOUCIANT'' is an adjective derived from French. It describes a state of being carefree, unconcerned, or indifferent.
An insouciant person lacks concern about things that others might find stressful or important. It carries a sense of lightheartedness.
To find the antonym, we need a word that describes someone who is overly concerned, worried, or stressed.
Step 2: Detailed Explanation:
Breakdown of meanings:
1. INSOUCIANT (Target): Free from concern, worry, or anxiety; carefree.
2. Anxious (Option D): Feeling or showing worry, unease, or nervousness. This is the exact psychological polar opposite of being insouciant.
3. Nonchalant (Option B): Feeling or appearing casually calm and relaxed; not displaying anxiety. This is a synonym of insouciant.
4. Languid (Option C): (Of a person, manner, or gesture) displaying or having a disinclination for physical exertion or effort; slow and relaxed. While it implies a lack of energy, it doesn't necessarily mean a lack of concern.
5. Flamboyant (Option A): Tending to attract attention because of exuberance, confidence, and stylishness. This is about outward appearance, not inner state of mind.
An insouciant student doesn't care about a failing grade; an anxious student loses sleep over it. Thus, (D) is the correct antonym.
Step 3: Final Answer:
The word most nearly opposite to INSOUCIANT is Anxious (Option D).