1. constructed or fitted so tightly as to be impervious to water: The ship had six watertight compartments.
2. so devised or planned as to be impossible to defeat, evade, or nullify: a watertight contract; a watertight alibi.
"ships can be watertight in harbours."
"people can be watertight for athletes."
"deals can be watertight in terms."
"cases can be watertight."
"compartments can be watertight."
This list can help you learn new vocabulary more quickly and be able explore other words more easily.