The antonym of HUMBLE is:
ASubmissive
BUnassuming
CUnobtrusive
DArrogant
Answer & Solution
Correct answer: D. Arrogant
1. Humble means having a modest view of oneself.
2. Submissive, unassuming and unobtrusive are near neighbours.
3. Its opposite is arrogant.
_Source: Ordway, Synonyms and Antonyms (Project Gutenberg)_