Antonym of OSTENTATIOUS

awkward
bankrupt
ignorant
unpretentious

The correct answer is D. unpretentious.

Ostentatious means showing off or attempting to impress by affecting greater importance, talent, culture, etc., than is actually possessed.

Awkward means lacking grace or ease in movement or behavior.

Bankrupt means having insufficient funds to meet current

liabilities.

Ignorant means lacking knowledge or awareness in general; uneducated or unsophisticated.

Unpretentious means not claiming or demanding attention or respect; modest.

Therefore, the word that is most opposite in meaning to ostentatious is unpretentious.