The antonym of "nonchalant" is. ------.

Certainly! Let's break down the antonym of "nonchalant" and provide an explanation:

Original word: "nonchalant"

Antonym: "concerned"

Explanation:

1. Meaning of "nonchalant": "Nonchalant" refers to a person who is calm, casual, or indifferent, often in a way that suggests a lack of concern or enthusiasm.

2. Antonym Selection - "concerned": An antonym is a word that has the opposite meaning. In the given options, "concerned" is the antonym that best reflects the opposite idea. "Concerned" implies a state of being interested, involved, or caring about something, which contrasts with the indifferent or casual attitude conveyed by "nonchalant."

3. Other options:

- ক "needless": This does not convey the opposite meaning of "nonchalant." "Needless" means unnecessary or not required.

- খ "apathetic": While "apathetic" shares some similarity in meaning with "nonchalant," it is not the direct opposite. "Apathetic" refers to a lack of interest, enthusiasm, or concern.

- ঘ "beneficial": This is unrelated to the concept of being indifferent or casual.

In summary, "concerned" is chosen as the antonym because it represents a state of being interested or involved, which contrasts with the indifferent demeanor associated with "nonchalant."