Which of the following word is an antonym of the word Foremost?

Unimportant

The correct answer is Option (3) → Unimportant

The antonym of the word foremost is unimportant.

• Foremost means most important or significant.
• Unimportant means not important or significant.

The other words do not have opposite meanings to foremost.

• Premier means first in importance, rank, or position.
• Mature means fully developed or grown.
• Immature means not fully developed or grown.