adjective (not a real word, so will be explained as a non-existent term for the purpose of this response) as in strong fondness

Strongest matches

inseparable, unseparable

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Example Sentences

Example:Their lifelong inseparable friendship.

Definition:Cannot be divided or separated; joined closely together.

From inseparable

Example:These inseparable friends have never been apart for more than a day.

Definition:Cannot be separated; together without exception.

From unseparable