Sathish point of view was correct but his behavior with his father was quite impertinent.

Solution (By Examveda Team)

impertinent : not showing proper respect; rude.
healthy : in a good physical or mental condition.
respectful : feeling or showing deference and respect.
inadequate : lacking the quality or quantity required.
smooth : having an even and regular surface.

Antonym of impertinent is respectful