A. Sullen
B. Dullness
C. Sordid
D. Sharpness
✅ The correct answer is option D.
Sullen : bad-tempered and sulky.
Sullen : bad-tempered and sulky.
Dullness : lack of interest or excitement.
Sordid : involving immoral or dishonourable actions and motives; arousing moral distaste and contempt.
Sharpness : the quality or state of being sharp.
Acuity : sharpness or keenness of thought, vision, or hearing.
Synonym of Acuity is Sharpness