A. Awful
B. Irrelevant
C. Shallow
D. Profound
✅ The correct answer is option D.
Awful : very bad or unpleasant.
Awful : very bad or unpleasant.
Irrelevant : not connected with or relevant to something.
Shallow : of little depth.
Profound : (of a subject or idea) demanding deep study or thought.
Abstruse : difficult to understand; obscure.
Synonym of Abstruse is Profound