i is the first letter in the words:
inconspicuous, inane, idiot, immediate, irate, insecure, insure, irritate, impale, inure, implode, intuition, incident, inappropriate, idiocy, impure, inkling, ingest, ibis, ibex, impulse, ionise, ionosphere, iconoclast, incoherent, impede, inject, infect, insane, idle…
i`ll stop there. feel free to add to the list. [come on, it`s fun, try it, you`ll like it.]
