Definition

Describing something that is sealed tightly so that water cannot get in or out, or something that is so well-constructed that it cannot be easily challenged or disproven.

Example

The new roof is completely watertight, ensuring that no rainwater will leak inside the house.

Conversation

Did you hear about the new waterproof phone cases?

Yeah, I heard they’re supposed to be watertight for diving.

That sounds awesome! I need something that can handle my kayaking trips.

For sure! A watertight case would be perfect for keeping your phone safe.

Synonyms & Antonyms

Root Explanation

Watertight is formed from "water" (from Old English "wæter", meaning liquid that falls as rain or flows in rivers) and "tight" (from Old English "tihht", meaning firmly held or secure). The word describes something that is secure against the passage of water.

Memory Tip

Think of something that is 'secure' ('tight') against 'water' — that's why watertight means it won't let water in.

Visually Confused Words