English Vocabulary — Antonym (choose the word opposite in meaning to the highlighted word). Sentence: Satish's point of view was correct, but his behaviour with his father was quite impertinent.

Introduction / Context:
This sentence evaluates social-interaction vocabulary. “Impertinent” describes behavior that is rude or insolent toward authority figures. The antonym must show courtesy and proper respect.

Given Data / Assumptions:

• Target adjective: impertinent = rude, insolent, disrespectful.
• Context: Behaviour toward one’s father.
• Options: healthy, respectful, inadequate, smooth.

Concept / Approach:
In etiquette or hierarchy contexts, the clearest opposite of “impertinent” is “respectful.” Other adjectives either concern quality/adequacy or texture/fluency, which are irrelevant to conduct toward elders.

Step-by-Step Solution:

Verification / Alternative check:
With substitution, “his behaviour … was respectful” reverses the evaluative stance and fits cultural expectations in family contexts.

Why Other Options Are Wrong:

• healthy: Pertains to well-being; irrelevant.
• inadequate: Concerns sufficiency; wrong semantic field.
• smooth: Describes manner/texture; not a moral-social opposite.

Common Pitfalls:
Choosing a vaguely positive word that does not directly oppose rudeness. Precision matters in antonym items.

Final Answer:
respectful