ignorant person. ignoramus, illiterate.

ignore, v. disregard, slight, connive, overlook.

ill, a. ailing, sick, unwell; evil, unfavorable, adverse, bad.

ill at ease. uneasy, uncomfortable, anxious.

ill-boding, a. ominous, inauspicious.

illegal, a. illicit, unlawful, contraband, unlicensed, illegitimate.

illegality, n. unlawfulness, illegitimacy.

illegitimate, a. bastard, adulterine; illegal, illicit; spurious.

illegitimate, v. illegitimatize, bastardize.

illiberal, a. ungenerous, parsimonious, stingy; narrow-minded, bigoted.

illiberality, n. parsimony, stinginess; narrow-mindedness, bigotry, intolerance.

illicit, a. prohibited, unlawful.

illness, n. malady, sickness, disease.

illogical, a. fallacious, sophistical, unsound.

illusion, n. mockery, hallucination, chimera, phantasm, delusion, glamour.

illusive, a. delusive, illusory, chimerical, mocking.

illustrate, v. elucidate, picture, demonstrate, exemplify.

illustration, n. elucidation, exemplification; comparison, example, simile.

ill-will, n. malice, resentment, grudge, rancor, malevolence, antipathy, hatred.

image, n. statue; effigy, figure; ikon, eikon; idol.

image breaker. iconoclast, idoloclast, vandal.

image breaking. iconoclasm, vandalism.

image worship iconolatry, iconoduly.

imaginary, a. fancied, visionary, chimerical, illusive, phantasmal.

imagination, n. fancy, conception, notion, conceit, figment, phantasm.

imagine, v. conceive, fancy; think, suppose, opine, apprehend.

imbecile, n. idiot, witling, fool.

imbecility, n. idiocy, fatuity, foolishness, amentia.

imbedded, a. enfonced.

imitate, v. copy, ape, counterfeit; personate, impersonate, mimic, simulate; parody, caricature.

imitation, n. copy, counterfeit; mimicry, impersonation, mimesis; pasticcio; parody, travesty, burlesque; onomatopoeoea.

imitative, a. apish, copying, mimicking, mimetic; onomatopoetic.

imitator, n. copyist, follower, mimic, mime, ape, echo, impersonator.

immanence, n. inherence, indwelling.

immanent, a. inherent, indwelling.

immature, a. undeveloped, embryonic, crude, unripe, premature, untimely.

immediately, adv. instantly, forthwith, directly, straightway, at once, now, instanter.  Antonyms:  hereafter, by and by, after a while.

immense, a. vast, infinite, illimitable, immeasurable.

immerse, v. submerge, plunge into, dip, immerge, douse; engross.

immersed, a. submerged, plunged into; engrossed, absorbed, occupied.

immersion, n. submersion, immersing; engrossment, absorption.

immoderate, a. excessive, exorbitant, inordinate, intemperate, unrestrained.