Innate, inborn, inbred, congenital, hereditary, inherited are comparable but not wholly synonymous terms that refer to qualities which either are or seem to be derived from one’s inheritance or from conditions attending one’s birth or origin.
Injure, harm, hurt, damage, impair, mar, spoil all mean to affect someone or something so as to rob it of soundness, strength, or perfection or to reduce its value, usefulness, or effectiveness.
Initiate, induct, inaugurate, install, invest are comparable when meaning to put one through the processes, ceremonies, or other formalities regarded as essential to one’s being admitted to one’s duties as a member or an official.
Initial, original, primordial can all mean existing at or constituting the beginning or start of a thing, especially of a thing that gradually assumes shape or form or that manifests itself in many ways.
Inform, animate, inspire, fire are comparable when they mean to infuse (a person or thing) with something (as a spirit, a principle, an idea, or a passion) that gives him or it effective power or an urge to action or activity.