Built-in and Deep down

Built-in adjective - Being a part of the innermost nature of a person or thing.

Deep down and built-in are semantically related In some cases you can use "Deep down" instead an adjective phrase "Built-in".

Deep down adverb - In reality.

Built-in and deep down are semantically related in ingrained topic. Sometimes you can use "Built-in" instead an adjective phrase "Deep down".