1. superlative form of immense; extremely large in size, extent, or degree; greatest in immensity
Usage: superlative degree; formal or literary register

Examples

• The immensest ocean on Earth is the Pacific.
• She felt an immensest sense of relief when the crisis ended.
• The immensest challenge facing the team was the tight deadline.
• That was the immensest crowd I have ever seen at a concert.
• The immensest wealth in the world cannot buy happiness.
• He displayed the immensest courage during the rescue mission.