impel (im-pel'), urge on, drive.
impending (im-pend'ing), overhanging, threatening.
impenetrable (im-pen'e-tra-b'l), cannot be entered.
imperceptible (im'per-sep'ti-b'l), not easily seen or noticed.
imperious (im-pe'ri-us), haughty, kingly.
impetuous (im-pet'u-us), rushing violently; hasty.
implacable (im-pla'ka-b'l), not to be pacified; unforgiving.
importtune (im'por-tun'), urge constantly.
imposition (im'po'-zish'un), deceit; fraud.
imposture (im-pos'tur), cheat; trick.