a. 二年级学生的, 一知半解的, 幼稚而自大的

Sophomoric \Soph`o*mor"ic\, Sophomorical \Soph`o*mor"ic*al\, a.
Of or pertaining to a sophomore; resembling a sophomore;
hence, pretentious; inflated in style or manner; as,
sophomoric affectation. [U. S.]