inherent
in-HEER-untadjMeaning existing as a natural, permanent part of something
Memory hook IN HERE: built right in. Every lemon, big or small, is sour; the sourness is in here, part of what a lemon is: it is inherent.
A little mess is inherent in finger painting.
In context Delay was inherent in sending letters by ship; no matter how hard the sailors worked, the crossing simply took weeks.
Similar built-in, essential, intrinsic, basic
Opposite extrinsic, external, added
From Latin inhaerere, “to stick in”: in- (in) + haerere (to stick).