noun as in strong fondness

Strongest matches

impregnable, waterproof

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Example Sentences

Example:Despite the enemy's best efforts, the fortress was impregnable and provided perfect unsinkability.

Definition:Unassailable; impossible to break through, overcome, or breach.

From impregnable

Example:The lifeboats were waterproof and designed to ensure unsinkability in case the mother ship was destroyed.

Definition:Can be used to describe something such as a piece of clothing, a box, or a room that is protected against water or rain and does not let water in, or airtight, especially when used for boats or ships.

From waterproof