1. most marshy; having the greatest amount of soft, wet ground
Usage: superlative form of marshy

Examples

• The marshiest part of the wetland was impossible to cross on foot.
• We avoided the marshiest areas when planning our hiking route.
• The marshiest section of the park floods every spring.
• Birds prefer nesting in the marshiest regions of the reserve.
• The marshiest ground was marked with warning signs.
• Construction was delayed due to the marshiest conditions in decades.