inbuilt
adjective
[ ˈɪnbɪlt ]
• existing as an original or essential part of something or someone.
• "the body's inbuilt ability to heal itself"
Similar:
built-in,
integral,
incorporated,
inherent,
intrinsic,
innate,
ingrained,
congenital,
natural,
native,
basic,
fundamental,
essential,
deep-rooted,
connatural,
connate,