A. professional
B. immature
C. unimaginative
D. ignorant
Erudite : having or showing great knowledge or learning.
Professional : relating to or belonging to a profession.
Immature : not fully developed.
Unimaginative : not readily using or demonstrating the use of the imagination; stolid and somewhat dull.
Ignorant : lacking knowledge or awareness in general; uneducated or unsophisticated.
Antonym of Erudite is Ignorant