Sanjay's point of view was correct but his behaviour with his father was quite impertinent.

Solution (By Examveda Team)

Impertinent : not showing proper respect; rude.
Impressive : evoking admiration through size, quality, or skill; grand, imposing, or awesome.
Smooth : having an even and regular surface; free from perceptible projections, lumps, or indentations.
Healthy : in a good physical or mental condition; in good health.
Respectful : feeling or showing deference and respect.

Antonym of Impertinent is Respectful