Intrinsic in refers to something that is an integral part of something else or exists within it naturally. Synonyms for intrinsic in include ingrained, innate, inherent, essential, fundamental, integral, native, and inherent. All these words describe things that exist within something naturally and cannot be separated from it. Ingrained describes something that has been deeply embedded over time, while innate refers to a quality that one is born with. Essential and fundamental both refer to something that is absolutely necessary. Integral describes something that is necessary to make a whole. Native means something that is natural to a particular place or person, while inherent describes a quality that is present from the beginning.